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The HaoChen CAD drawing software can be used for creating both 2D drawings and simple 3D drawings. When working with contour lines or inserted graphics, it sometimes happens that the line segments are not on the same plane, which leads to inaccurate calculations of angles and distances. So how can these lines be brought onto the same plane? Let me give you a detailed introduction next! The solution to lines not being in the same plane in CAD is as follows: The basic idea is to reduce the three-dimensional format to a two-dimensional one, because when creating drawings in CAD, operations are carried out along the x and y axes, which means everything remains within one plane. For the first operation, select the line segments that you want to be on the same plane; use Ctrl+1 to change their Z-coordinates to the same value. In this way, the 3D structure becomes 2D, as having the same Z-coordinate means these line segments are all on the same plane. As shown in the figure below: Another method is to make multiple moves to change the positional coordinates of the line segments, so that they end up in the same plane. The specific steps are as follows: 1. It must be done in the top-down view window to expand the group. 2. Select the entire image using Ctrl+A. 3. Use the move (m_) command, enter 0,0,0 for the position of the first point and press Enter to confirm, then enter the position of the second point ； 0,0,1e99 (which is the number one, the English letter E, and the number 99), then press Enter to confirm. 4. Select the entire image (Ctrl+A). 5. Use the move (m_) command, enter 0,0,1e99 for the position of the first point and press Enter to confirm; then enter 0,0,-1e99 for the position of the second point and press Enter to confirm. 6. Select all again. 7. Use the move (m_) command, enter 0,0,-1e99 for the position of the first point and press Enter to confirm; then enter 0,0,0 for the position of the second point and press Enter to confirm. 8. The conversion view can be used to check the zeroing condition. The above are the solutions for lines that are not in the same plane in the Haochen CAD drawing software; I hope they will be helpful to everyone.