SolidworksHow-ToBeginner · 3 min read

How to Draw Construction Line Xline in AutoCAD Quickly

In AutoCAD, draw a construction line by typing XLINE in the command bar and pressing Enter. Then choose the line type (horizontal, vertical, angle, bisector) and specify points to create an infinite line used as a guide.

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Syntax

The basic syntax to draw a construction line (Xline) in AutoCAD is:

XLINE - Starts the construction line command.
Options after command start:

H - Horizontal line
V - Vertical line
A - Line at a specified angle
B - Bisector of two lines
O - Offset from an existing line

Specify points or angles as prompted to place the line.

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XLINE
H
Specify a point for horizontal construction line:

Output

An infinite horizontal construction line appears at the specified point.

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Example

This example shows how to draw a vertical construction line at a chosen point.

autocad

Command: XLINE
Specify an option [Horizontal/Vertical/Angle/Bisector/Offset]: V
Specify a point for vertical construction line:

Output

An infinite vertical construction line appears at the chosen point.

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Common Pitfalls

Not specifying the correct option after XLINE can create unexpected line directions.
For angle lines, forgetting to enter the angle value causes errors.
Trying to draw Xline without specifying a point will pause the command waiting for input.
Using construction lines as permanent objects instead of guides can clutter your drawing.

autocad

Wrong:
XLINE
Specify an option [Horizontal/Vertical/Angle/Bisector/Offset]: A
(Forgets to enter angle)

Right:
XLINE
A
Enter angle of line: 45
Specify a point for angled construction line:

Output

Creates an angled infinite construction line at 45 degrees from the specified point.

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Quick Reference

Option	Description
H	Draws a horizontal infinite construction line
V	Draws a vertical infinite construction line
A	Draws a construction line at a specified angle
B	Draws a bisector line between two selected lines
O	Draws an offset construction line from an existing line

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Key Takeaways

Use the XLINE command to create infinite construction lines as guides.

Choose options like Horizontal (H), Vertical (V), or Angle (A) to control line direction.

Always specify a point after choosing the line type to place the construction line.

Avoid leaving construction lines as permanent objects; use them only for reference.

Remember to enter angle values when using the Angle option to avoid errors.