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When using the Haochen CAD drawing software to create drawings, it is often necessary to indicate slopes on those drawings. However, some beginners are not very familiar with how to do this. Below, we will provide a detailed explanation of how to indicate slopes in CAD drawings! The steps for adding slope annotations in CAD are as follows: 1. First, open HaoChen CAD, then open the drawing for which slope annotations are required. 2. Next, enter the shortcut command pl in the command line, and then specify the starting point as indicated by the command line; in this case, it should be set at the midpoint of the step. Then enter ‘h’ in the command line, and follow the on-screen prompts to enter the half-width of the starting point; since it’s an arrow being drawn, the half-width of the starting point must be set to 0. After that, enter the half-width of the ending point – enter whatever value you need (100 in this case), and press Enter to confirm. As shown in the figure below: 3. Next, turn on orthography; by dragging downward, a small arrow will appear, as shown in the figure below. 4. Use the L command to draw a straight line behind the small arrow. The above is a detailed tutorial on how to use CAD for marking slopes in the Haochen CAD drawing software. In actual drawing tasks, marking is one of the most commonly used functions; I hope everyone can master the use of these common marking techniques!