1. First open AutoCad20 14, enter the classic workspace, and draw a straight line with a specified length directly in the Cad drawing area.

2. Directly enter the shortcut key "L" (line) of the "line" drawing command, press the space bar to confirm, enter the line drawing command, and start drawing a line.

3. Click any point on the AutoCad drawing area with the left mouse button as the starting point of the straight line. At this time, you can freely drag the mouse to draw a straight line.

4. Enter the limit of straight line @ straight line length value+.