为了解决CAD水平测试的自动化阅卷问题，实现AutoCAD绘图题的计算机判分，提取CAD图形数据信息是关键。研究了三维几何造型开发工具ACIS的模型及其存储文件SAT的格式，给出了一种从SAT文件中提取CAD图形数据信息的方法，通过实例验证了该方法的有效性和正确性。-CAD proficiency test in order to solve the problem of automated scoring, AutoCAD drawing to achieve sub-sub-theme computer, extract the CAD graphic data is the key. Studied the three-dimensional geometric modeling and model development tools ACIS SAT file format stores, given a SAT file extracted from the CAD graphic data methods, an example verified the validity and correctness.