<span data-lang="zh">DXF 组码完全参考手册</span><span data-lang="en">DXF Group Codes Complete Reference Manual</span>

DXF 组码完全参考手册DXF Group Codes Complete Reference Manual

DXF Reference

涵盖 AutoCAD DXF 文件格式的所有组码定义、数据类型、实体编码规则与分类详解Comprehensive reference covering all group code definitions, data types, entity encoding rules, and classifications for AutoCAD DXF files

200+

已定义组码Defined Group Codes

数据类型Data Types

30+

实体类型Entity Types

DXF 文件节DXF Sections

📐

数据类型总表Data Type Summary

DXF 中每个组码范围对应固定的数据类型。下表列出所有组码范围及其对应的数据类型。Each group code range in DXF maps to a fixed data type. The following table lists all ranges and their corresponding types.

组码范围Code Range	数据类型Data Type	说明Description
-5 ~ -1	特殊	仅在 AutoLISP/ObjectARX 中使用Used only in AutoLISP/ObjectARX
0 ~ 9	String	字符串，AutoCAD 2000 起上限 2049 字符String, max 2049 chars since AutoCAD 2000
10 ~ 39	Double	双精度三维点（X=10, Y=20, Z=30 系列）Double precision 3D point (X=10, Y=20, Z=30 series)
40 ~ 59	Double	双精度浮点值（半径、高度、角度等标量）Double precision float (radius, height, angles, etc.)
60 ~ 79	Int16	16 位整数（标志位、模式、重复计数）16-bit integer (flags, modes, repeat counts)
90 ~ 99	Int32	32 位整数（顶点数、元素数量等）32-bit integer (vertex counts, element counts)
100	String	子类标记（Subclass Marker），如 “AcDbCircle”Subclass Marker, e.g. “AcDbCircle”
102	String	控制字符串 “{name}” / “}”Control string “{name}” / “}”
105	Handle	DIMVAR 符号表对象句柄DIMVAR symbol table object handle
110 ~ 139	Double	UCS 原点/轴方向向量（X=110, Y=120, Z=130）UCS origin/axis direction (X=110, Y=120, Z=130)
140 ~ 149	Double	双精度标量值（DIMSTYLE 设置等）Double precision scalar (DIMSTYLE settings, etc.)
170 ~ 179	Int16	16 位整数（DIMSTYLE 标志位）16-bit integer (DIMSTYLE flags)
210 ~ 239	Double	拉伸方向向量（X=210, Y=220, Z=230）Extrusion direction vector (X=210, Y=220, Z=230)
270 ~ 289	Int16	16 位整数（杂项标志）16-bit integer (miscellaneous flags)
290 ~ 299	Boolean	布尔标志值（0=False, 1=True）Boolean flag (0=False, 1=True)
300 ~ 309	String	任意字符串Arbitrary string
310 ~ 319	Binary	二进制数据块（十六进制字符串，最多 127 字节）Binary chunk (hex string, max 127 bytes)
320 ~ 329	Handle	原始句柄值（INSERT/XREF 时不转换）Raw handle (no translation on INSERT/XREF)
330 ~ 339	Soft Ptr	软指针句柄（指向其他对象的引用）Soft pointer handle (reference to other objects)
340 ~ 349	Hard Ptr	硬指针句柄（强引用，不可为 NULL）Hard pointer handle (strong reference, non-NULL)
350 ~ 359	Soft Own	软所有者句柄Soft owner handle
360 ~ 369	Hard Own	硬所有者句柄Hard owner handle
370 ~ 379	Int16	线宽枚举值（LineWeight）Lineweight enum value
380 ~ 389	Int16	打印样式名类型枚举Plot style name type enum
390 ~ 399	Handle	打印样式对象句柄Plot style object handle
400 ~ 409	Int16	16 位整数16-bit integer
410 ~ 419	String	应用程序名称（如 “ACAD”）Application name (e.g. “ACAD”)
420 ~ 429	Int32	真彩色值（0x00RRGGBB）True color value (0x00RRGGBB)
430 ~ 439	String	颜色名称Color name
440 ~ 449	Int32	透明度值Transparency value
450 ~ 459	Int64	64 位长整数64-bit long integer
460 ~ 469	Double	双精度浮点值Double precision float
470 ~ 479	String	字符串String
999	String	DXF 注释（OPEN 忽略，SAVEAS 不输出）DXF comment (ignored by OPEN, not output by SAVEAS)
1000 ~ 1009	String	扩展数据 XDATA 字符串XDATA string
1010 ~ 1059	Double	XDATA 中的点/浮点值XDATA point/float values
1060 ~ 1070	Int16	XDATA 中的整数值XDATA integer values
1071	Int32	XDATA 中的长整数值XDATA long integer

三维点规则3D Point Rule 组码 10~39 采用 X/Y/Z 拆分编码：X 组码 = 基值（如 10），Y 组码 = 基值 + 10（如 20），Z 组码 = 基值 + 20（如 30）。若省略 Z，默认值为 0。Group codes 10-39 use X/Y/Z split encoding: X code = base (e.g. 10), Y code = base + 10 (e.g. 20), Z code = base + 20 (e.g. 30). If Z is omitted, default is 0.

🔒

特殊/内部组码Special / Internal Codes

这些组码仅用于 AutoLISP 和 ObjectARX 应用程序内部，不会出现在 DXF 文件中。These codes are used internally by AutoLISP and ObjectARX applications and do not appear in DXF files.

组码Code	英文名称English Name	中文说明Chinese Description
-5	Persistent Reactor ChainPersistent Reactor Chain	永久反应器链Persistent Reactor Chain
-4	Conditional Operator (ssget)Conditional Operator (ssget)	条件运算符（仅 ssget 使用）Conditional Operator (ssget only)
-3	XDATA MarkerXDATA Marker	扩展数据标记XDATA Marker
-2	Entity Name ReferenceEntity Name Reference	图元名参照Entity Name Reference
-1	Entity NameEntity Name	图元名（运行时动态分配）Entity name (runtime dynamic)

⚙️

通用实体组码 (0~99)Common Entity Codes (0-99)

每个图形实体（图元）共有的属性组码。标注为”固定”的组码几乎在每个实体中出现。Attribute codes common to every graphical entity. Codes marked “fixed” appear in nearly every entity.

组码Code	英文名称English Name	中文说明Chinese Description	数据类型Type	固定Fixed
0	Entity Type	实体类型（如 LINE, CIRCLE 等）Entity type (e.g. LINE, CIRCLE)	String	是Yes
1	Primary Text Value	实体的主文字值Primary text value of entity	String	–
2	Name	名称（属性标记、块名、标注样式名等）Name (attribute tag, block name, dimstyle, etc.)	String	–
3	Supplementary Text	辅助文本（属性提示、附加文字等）Supplementary text (attribute prompts, extra text)	String	–
4	Other Text/Name	其他文字或名称值Other text or name value	String	–
5	Handle	实体句柄（十六进制字符串）Entity handle (hex string)	String	是Yes
6	Linetype Name	线型名称Linetype name	String	是Yes
7	Text Style Name	文字样式名称Text style name	String	是Yes
8	Layer Name	图层名称Layer name	String	是Yes
9	Variable Name Identifier	DXF HEADER 段变量名（如 $ACADVER）DXF HEADER variable name (e.g. $ACADVER)	String	仅 HEADERHEADER only
10	Primary Point X	主点 X（圆心、起点、插入点等）Primary point X (center, start, insert point)	Double	–
11	Other Point X	其他点 X（终点、第二点等）Other point X (end point, second point)	Double	–
12	Other Point X	其他点 XOther point X	Double	–
13~18	Other Points X	其他点 X 值（标注定义点等）Other point X values (dimension definition points)	Double	–
20	Primary Point Y	主点 YPrimary point Y	Double	–
21~28	Other Points Y	其他点 Y 值Other point Y values	Double	–
30	Primary Point Z	主点 ZPrimary point Z	Double	–
31~37	Other Points Z	其他点 Z 值Other point Z values	Double	–
38	Entity Elevation	实体标高（非零时有效）Entity elevation (when non-zero)	Double	–
39	Entity Thickness	实体厚度（非零时有效）Entity thickness (when non-zero)	Double	是Yes
40	Double Float Value	浮点值（半径、高度、缩放等）Float value (radius, height, scale)	Double	–
41	Double Float Value	X 方向缩放、宽度等X scale factor, width	Double	–
42	Double Float Value	凸度（LWPOLYLINE）、Y 缩放等Bulge (LWPOLYLINE), Y scale	Double	–
43	Double Float Value	Z 方向缩放、列间距等Z scale, column spacing	Double	–
44	Double Float Value	标注箭头大小等Dimension arrow size	Double	–
45~47	Double Float Value	其他标量值Other scalar values	Double	–
48	Linetype Scale	线型比例Linetype scale factor	Double	–
49	Repeated Double Value	重复浮点值（如线型虚线长度）Repeated float (e.g. linetype dash lengths)	Double	–
50	Angle (degrees)	角度值（DXF 中以度为单位）Angle in degrees	Double	–
51	Angle (degrees)	角度值（终点角度等）Angle (end angle, etc.)	Double	–
52~58	Angle (degrees)	其他角度值Other angle values	Double	–
60	Entity Visibility	实体可见性（0=可见, 1=不可见）Visibility (0=visible, 1=invisible)	Int16	–
62	Color Number	颜色号（0=ByBlock, 256=ByLayer）Color number (0=ByBlock, 256=ByLayer)	Int16	是Yes
66	Entity Follow Flag	实体跟随标志（如 VERTEX 跟随 POLYLINE）Entity follow flag (e.g. VERTEX follows POLYLINE)	Int16	是Yes
67	Space Flag	空间标志（0=模型空间, 1=图纸空间）Space flag (0=model space, 1=paper space)	Int16	是Yes
68	Viewport State	视口状态（打开/关闭/未激活）Viewport state (on/off/not active)	Int16	–
69	Viewport Number	视口标识号Viewport identification number	Int16	–
70	Integer Value	整数值（标志位、重复计数、闭合标志等）Integer (flags, repeat count, closed flag)	Int16	–
71~78	Integer Values	整数值（列数/行数、标注类型、文字对齐等）Integer (col/row count, dim type, text alignment)	Int16	–
90	32-bit Integer	32 位整数（顶点总数等）32-bit integer (total vertex count)	Int32	–
91~99	32-bit Integers	32 位整数32-bit integers	Int32	–

未找到匹配的组码No matching group codes found

🔗

子类标记与对象引用 (100~399)Subclass Markers & Object References (100-399)

子类标记用于标识实体所属的 DXF 类层次，对象引用组码用于建立实体间的关系链接。Subclass markers identify the DXF class hierarchy of entities. Object reference codes establish relationship links between entities.

组码Code	英文名称English Name	中文说明Chinese Description	数据类型Type
100	Subclass Marker	子类数据标记（如 “AcDbEntity”, “AcDbCircle”）Subclass data marker (e.g. “AcDbEntity”, “AcDbCircle”)	String
102	Control String	控制字符串 “{<name>}” 或 “}”Control string “{<name>}” or “}”	String
105	Object Handle (DIMVAR)	DIMVAR 符号表条目对象句柄DIMVAR symbol table entry handle	Handle
110	UCS Origin X	UCS 原点 X 值UCS origin X	Double
111	UCS X-Axis X	UCS X 轴方向 X 分量UCS X-axis direction X	Double
112	UCS Y-Axis X	UCS Y 轴方向 X 分量UCS Y-axis direction X	Double
120~122	UCS Origin/Axis Y	UCS 原点/轴 Y 值UCS origin/axis Y	Double
130~132	UCS Origin/Axis Z	UCS 原点/轴 Z 值UCS origin/axis Z	Double
140~149	Scalar Float Values	双精度标量值（DIMSTYLE 设置等）Scalar floats (DIMSTYLE settings)	Double
170~179	16-bit Integers	16 位整数（DIMSTYLE 标志位）16-bit integers (DIMSTYLE flags)	Int16
210	Extrusion Direction X	拉伸方向 X 分量Extrusion direction X	Double
220	Extrusion Direction Y	拉伸方向 Y 分量Extrusion direction Y	Double
230	Extrusion Direction Z	拉伸方向 Z 分量Extrusion direction Z	Double
270~279	16-bit Integers	杂项 16 位整数标志Miscellaneous 16-bit flags	Int16
280~289	16-bit Integers	杂项 16 位整数标志Miscellaneous 16-bit flags	Int16
290~299	Boolean Flags	布尔标志值（0=False, 1=True）Boolean flags (0=False, 1=True)	Boolean
300~309	Arbitrary Strings	任意字符串Arbitrary strings	String
310~319	Binary Data Chunks	二进制数据块（十六进制字符串，最多 127 字节）Binary data (hex string, max 127 bytes)	Binary
320~329	Hard Handles	原始句柄值（INSERT/XREF 时不转换）Raw handles (no translation on INSERT/XREF)	Handle
330~339	Soft Pointers	软指针句柄（指向其他对象的弱引用）Soft pointer (weak reference to other objects)	Soft Ptr
340~349	Hard Pointers	硬指针句柄（强引用，不可为 NULL）Hard pointer (strong reference, non-NULL)	Hard Ptr
350~359	Soft Owners	软所有者句柄Soft owner handles	Soft Own
360~369	Hard Owners	硬所有者句柄Hard owner handles	Hard Own
370	Lineweight	线宽枚举值Lineweight enum value	Int16
380	PlotStyleName Type	打印样式名类型枚举Plot style name type enum	Int16
390	PlotStyleName Handle	打印样式对象句柄Plot style object handle	Handle

🎨

颜色与打印样式 (400~479)Color & Plot Style (400-479)

真彩色、颜色名称、透明度及打印样式相关组码。Group codes for true color, color names, transparency, and plot styles.

组码Code	英文名称English Name	中文说明Chinese Description	数据类型Type
400~409	16-bit Integers	16 位整数（预留）16-bit integers (reserved)	Int16
410	App Name	应用程序名称（如 “ACAD”）Application name (e.g. “ACAD”)	String
420	True Color (RGB)	真彩色 32 位值 (0x00RRGGBB)True color 32-bit (0x00RRGGBB)	Int32
430	Color Name	颜色名称字符串Color name string	String
440	Transparency	透明度值Transparency value	Int32
450~459	Long Integers	64 位长整数64-bit long integers	Int64
460~469	Double Floats	双精度浮点值Double precision floats	Double
470~479	Strings	字符串Strings	String

📦

扩展数据 XDATA (1000~1071)Extended Data XDATA (1000-1071)

扩展数据是应用程序附加到 DXF 实体上的自定义数据，以组码 1000~1071 编码。Extended data is custom data attached to DXF entities by applications, encoded with group codes 1000-1071.

组码Code	英文名称English Name	中文说明Chinese Description	数据类型Type
1000	XDATA String	ASCII 字符串（最多 255 字节）ASCII string (max 255 bytes)	String
1001	Registered App Name	注册的应用程序名（最多 31 字节）Registered app name (max 31 bytes)	String
1002	XDATA Control String	控制字符串 “{” 或 “}”Control string “{” or “}”	String
1003	XDATA Layer Name	XDATA 图层名XDATA layer name	String
1004	XDATA Binary Chunk	二进制数据块（最多 127 字节）Binary chunk (max 127 bytes)	Binary
1005	XDATA Handle	实体句柄（十六进制字符串）Entity handle (hex string)	Handle
1010	XDATA Point	XDATA 点 X 值XDATA point X	Double
1011	XDATA 3D World Position	世界空间位置 X3D world space position X	Double
1012	XDATA 3D World Displacement	世界空间位移 X3D world space displacement X	Double
1013	XDATA 3D World Direction	世界空间方向 X3D world space direction X	Double
1020,1030	XDATA Point Y/Z	XDATA 点 Y/Z 值XDATA point Y/Z	Double
1021~1033	XDATA Position Y/Z	XDATA 位置/位移/方向 Y/ZXDATA position/displacement/direction Y/Z	Double
1040	XDATA Float	XDATA 浮点值XDATA float value	Double
1041	XDATA Distance	XDATA 距离值XDATA distance value	Double
1042	XDATA Scale	XDATA 缩放比例XDATA scale factor	Double
1070	XDATA 16-bit Integer	16 位有符号整数16-bit signed integer	Int16
1071	XDATA 32-bit Integer	32 位有符号长整数32-bit signed long integer	Int32

🧱

实体组码详解Entity Group Codes Detail

每种 DXF 图形实体有自己特有的组码组合。以下按实体类型逐一列出所有专属组码。Each DXF entity type has its own specific combination of group codes. The following lists all dedicated codes by entity type.

LINE 直线Line

组码Code	英文名称English Name	中文说明Chinese Description
10	Start Point	起点 (配合 20,30)Start point (with 20,30)
11	End Point	终点 (配合 21,31)End point (with 21,31)

CIRCLE 圆Circle

组码Code	英文名称English Name	中文说明Chinese Description
10	Center Point	圆心 (配合 20,30)Center (with 20,30)
40	Radius	半径Radius

ARC 圆弧Arc

组码Code	英文名称English Name	中文说明Chinese Description
10	Center Point	圆心 (配合 20,30)Center (with 20,30)
40	Radius	半径Radius
50	Start Angle	起始角度（度）Start angle (degrees)
51	End Angle	终止角度（度）End angle (degrees)

TEXT 单行文字Single-line Text

组码Code	英文名称English Name	中文说明Chinese Description
1	Text Value	文字内容Text content
10	Insertion Point	插入点Insertion point
40	Text Height	文字高度Text height
41	Width Factor	宽度比例因子Width factor
50	Rotation Angle	旋转角度Rotation angle
51	Oblique Angle	倾斜角度Oblique angle
71	Text Generation Flags	文字生成标志（2=倒置, 4=反向）Text gen flags (2=upside-down, 4=backward)
72	Horizontal Justification	水平对齐方式H-justification
73	Vertical Justification	垂直对齐方式V-justification

MTEXT 多行文字Multiline Text

组码Code	英文名称English Name	中文说明Chinese Description
1	Text Value	多行文字内容（含格式代码）Text content (with format codes)
3	Additional Text	附加文字（超长时续接）Additional text (continuation)
10	Insertion Point	插入点Insertion point
40	Nominal Text Height	标称文字高度Nominal text height
41	Reference Rectangle Width	参考矩形宽度Reference rect width
42	Reference Rectangle Height	参考矩形高度Reference rect height
71	Attachment Point	文字对齐附着点Attachment point
72	Drawing Direction	文字绘制方向Drawing direction
73	MText Line Spacing Style	行间距样式Line spacing style
90	Column Type	分栏类型 (R2018+)Column type (R2018+)

DIMENSION 标注Dimension

组码Code	英文名称English Name	中文说明Chinese Description
1	Dimension Text	用户覆盖的标注文字User-overridden dimension text
2	Block Name	标注块名Dimension block name
3	Dimension Style Name	标注样式名Dimension style name
10	Definition Point	定义点（所有类型共用第一个）Definition point (first, common to all)
11	Text Midpoint	标注文字中点Text midpoint
13	First Extension Line Origin	第一条延伸线原点1st extension line origin
14	Second Extension Line Origin	第二条延伸线原点2nd extension line origin
15	Diameter/Radius Def. Point	直径/半径定义点Diameter/radius definition point
16	Angular Arc Point	角度标注弧线定义点Angular arc definition point
50	Dimension Line Angle	标注线旋转角度Dimension line angle
51	Horizontal Direction	水平方向角度Horizontal direction angle
70	Dimension Type	标注类型（0=线性, 1=对齐, 2=角度, 3=直径, 4=半径）Dim type (0=linear, 1=aligned, 2=angular, 3=diameter, 4=radius)

POLYLINE / LWPOLYLINE 多段线 / 轻量多段线Polyline / Lightweight

组码Code	英文名称English Name	中文说明Chinese Description
90	Number of Vertices	顶点总数Total vertex count
70	Polyline Flags	标志位（1=闭合, 128=Plinegen）Flags (1=closed, 128=Plinegen)
10	Vertex X	各顶点 X 坐标（连续出现）Vertex X (repeating)
20	Vertex Y	各顶点 Y 坐标（连续出现）Vertex Y (repeating)
40	Start Width	起始宽度Start width
41	End Width	终止宽度End width
42	Bulge	凸度（0=直线, 正=逆时针弧, 负=顺时针弧）Bulge (0=line, +=CCW arc, -=CW arc)
43	Constant Width	恒定宽度（全局）Constant width (global)

INSERT 块引用Block Insert

组码Code	英文名称English Name	中文说明Chinese Description
2	Block Name	块定义名称Block definition name
10	Insertion Point	插入点Insertion point
41	X Scale Factor	X 方向缩放比例X scale factor
42	Y Scale Factor	Y 方向缩放比例Y scale factor
43	Z Scale Factor	Z 方向缩放比例Z scale factor
50	Rotation Angle	旋转角度（度）Rotation angle (degrees)
66	Entity Follow Flag	属性跟随标志（1=有后续 ATTRIB）Attribute follow (1=has ATTRIBs)
70	Column Count	列数（阵列）Column count (array)
71	Row Count	行数（阵列）Row count (array)

SPLINE 样条曲线Spline Curve

组码Code	英文名称English Name	中文说明Chinese Description
70	Spline Flags	标志位（1=闭合, 2=周期, 4=平面, 8=线性）Flags (1=closed, 2=periodic, 4=planar, 8=linear)
71	Degree	曲线阶数（通常为 3=三次 B 样条）Degree (typically 3=cubic B-spline)
72	Number of Knots	节点数Knot count
73	Number of Control Points	控制点数Control point count
74	Number of Fit Points	拟合点数Fit point count
40	Knot Value	节点值（连续出现）Knot value (repeating)
10	Control Point	控制点坐标（连续出现）Control point (repeating)
11	Fit Point	拟合点坐标（连续出现）Fit point (repeating)

ELLIPSE 椭圆Ellipse

组码Code	英文名称English Name	中文说明Chinese Description
10	Center Point	椭圆中心Ellipse center
11	Major Axis Endpoint	长轴端点向量（相对于中心）Major axis endpoint vector (relative to center)
40	Minor Axis Ratio	短轴与长轴比值（0<ratio<=1）Minor-to-major axis ratio (0<ratio<=1)
41	Start Parameter	起始参数角度Start parameter angle
42	End Parameter	终止参数角度End parameter angle

HATCH 填充Hatch Fill

组码Code	英文名称English Name	中文说明Chinese Description
2	Pattern Name	填充图案名（如 ANSI31, SOLID）Pattern name (e.g. ANSI31, SOLID)
10	Elevation Point	标高点（仅实体填充）Elevation point (solid only)
41	Pattern Scale	图案缩放比例Pattern scale factor
52	Pattern Angle	图案旋转角度Pattern rotation angle
70	Hatch Style	填充样式（0=普通, 1=外部, 2=忽略）Hatch style (0=normal, 1=outer, 2=ignore)
71	Associativity Flag	关联标志（1=关联）Associativity (1=associative)
75	Hatch Pattern Type	图案类型（0=用户定义, 1=预定义, 2=自定义）Pattern type (0=user, 1=predefined, 2=custom)
76	Boundary Path Count	边界路径数量Boundary path count
91	Pattern Definition Lines	图案定义线数量Pattern definition line count

ATTRIB / ATTDEF 属性 / 属性定义Attribute / Attrib Def

组码Code	英文名称English Name	中文说明Chinese Description
1	Attribute Value	属性值 (ATTRIB) / 默认值 (ATTDEF)Value (ATTRIB) / Default (ATTDEF)
2	Attribute Tag	属性标记名Attribute tag name
3	Attribute Prompt	属性提示文字Attribute prompt text
10	Insertion Point	插入点Insertion point
40	Text Height	文字高度Text height
41	Width Factor	宽度比例因子Width factor
50	Rotation Angle	旋转角度Rotation angle
70	Attribute Flags	标志（1=不可见, 2=常量, 4=验证, 8=预置）Flags (1=invisible, 2=constant, 4=verify, 8=preset)
73	Field Length	字段长度Field length

LEADER 引线Leader

组码Code	英文名称English Name	中文说明Chinese Description
10	Leader Vertex	引线顶点坐标（连续出现）Leader vertex (repeating)
71	Annotation Type	注释类型（0=无, 1=文字, 2=公差, 3=块参照）Annotation type (0=none, 1=text, 2=tolerance, 3=block)
72	Path Type	路径类型Path type
73	Annotation Placement	注释放置方式Annotation placement

3DFACE 三维面3D Face

组码Code	英文名称English Name	中文说明Chinese Description
10	First Corner	第一角点First corner
11	Second Corner	第二角点Second corner
12	Third Corner	第三角点Third corner
13	Fourth Corner	第四角点（可选）Fourth corner (optional)
70	Invisible Edge Flags	不可见边标志（位码：1/2/4/8）Invisible edge flags (bit: 1/2/4/8)

SOLID 实心面 / 二维填充Solid / 2D Fill

组码Code	英文名称English Name	中文说明Chinese Description
10	First Corner	第一点First point
11	Second Corner	第二点Second point
12	Third Corner	第三点Third point
13	Fourth Corner	第四点（可选，默认=第三点）Fourth point (optional, defaults to 3rd)

MLINE 多重平行线Multiline

组码Code	英文名称English Name	中文说明Chinese Description
10	Start Point	起始顶点坐标Start vertex
11	Vertex Points	各顶点坐标（连续出现）Vertices (repeating)
19	End Point	终止顶点坐标End vertex
71	Justification	对齐方式（0=顶, 1=零, 2=底）Justification (0=top, 1=zero, 2=bottom)
72	Drawing Flags	绘制标志（1=闭合, 2=开始截断, 4=结束截断）Flags (1=closed, 2=start cap, 4=end cap)

TOLERANCE 公差Tolerance

组码Code	英文名称English Name	中文说明Chinese Description
1	Feature Control Frame	特征控制框架文字Feature control frame text
3	Feature Control Frame (cont.)	附加特征控制框架文字（可续接）Additional FCF text (continuation)
10	Insertion Point	插入点Insertion point
11	Leader Vertexes	引线顶点（连续出现）Leader vertices (repeating)

POINT 点Point

组码Code	英文名称English Name	中文说明Chinese Description
10	Point Location	点坐标Point coordinates
50	Angle (for UCS)	角度（UCS 相关）Angle (UCS related)

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全部实体类型列表Complete Entity Type List

DXF 中所有已定义的图形实体类型（即组码 0 可取的值）：All defined graphical entity types in DXF (values for group code 0):

基础几何实体Basic Geometry Entities

LINE POINT CIRCLE ARC ELLIPSE RAY XLINE HELIX

多段线与曲线Polylines & Curves

POLYLINE LWPOLYLINE SPLINE

面与体Faces & Bodies

3DFACE SOLID TRACE 3DSOLID BODY REGION SURFACE MESH

文字与标注Text & Dimensions

TEXT MTEXT DIMENSION ARC_DIMENSION TOLERANCE LEADER MULTILEADER SHAPE

块与属性Blocks & Attributes

INSERT MINSERT ATTRIB ATTDEF BLOCK ENDBLK

填充与图案Hatches & Patterns

HATCH MPOLYGON MLINE

其他Others

VIEWPORT UNDERLAY WIPEOUT ACAD_PROXY_ENTITY LIGHT OFRAME ACAD_TABLE

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DXF 文件节结构DXF File Section Structure

DXF 文件由若干节（SECTION）组成，每节以 0 SECTION 开始、0 ENDSEC 结束。组码 2 指定节名。A DXF file consists of several sections. Each starts with 0 SECTION and ends with 0 ENDSEC. Group code 2 specifies the section name.

节名Section Name	英文名称English Name	中文说明Chinese Description	关键组码Key Codes
`HEADER`	Header Section	全局变量定义（版本、精度、坐标系等）Global variable definitions (version, precision, coordinate system)	9（变量名）, 对应变量的值组码9 (var name), variable value codes
`CLASSES`	Classes Section	非内置类定义（C++ 类信息）Non-built-in class definitions (C++ class info)	100 1 2
`TABLES`	Tables Section	符号表定义（图层、线型、文字样式、标注样式等）Symbol table definitions (layers, linetypes, text styles, etc.)	0 2 70
`BLOCKS`	Blocks Section	块定义，含实体数据Block definitions, containing entity data	0 2 8
`ENTITIES`	Entities Section	图形实体数据（核心绘图内容）Graphical entity data (core drawing content)	0 8
`OBJECTS`	Objects Section	非图形对象（字典、XRECORD 等）Non-graphical objects (dictionaries, XRECORD, etc.)	100 0

DXF 结构示意DXF Structure
0 SECTION
2 HEADER
9 $ACADVER
1 AC1027
...（更多变量）
0 ENDSEC
0 SECTION
2 CLASSES
...（类定义）
0 ENDSEC
...（TABLES, BLOCKS, ENTITIES, OBJECTS）
0 EOF

DXF 组码完全参考手册 | 基于 AutoCAD DXF Reference 编制DXF Group Codes Complete Reference | Based on AutoCAD DXF Reference