The line graph processing often requires mechanical design. The article introduces how to use VB to deal with V belt wheel, gear and other parts when requiring a line drawing processing design of a train, so that the computer language and mechanical design would be as close as possible, improving design accuracy, and the efficiency to achieve a multiplier effect as well.%在机械设计中往往需要进行线图处理，本文介绍了使用VB语言对V带轮、齿轮等零件在设计时须应用线图处理设计的一种思路和方法，从而使计算机语言与机械设计紧密结合，提高设计的精准度，提高设计效率达到事半功倍的效果。
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