For broader application of stepper motor increasingly in various fields, the paper introduced the method to run the four-phase stepping motor by single-chip AT89C51. Because of the constraints of venues, apparatus, parts and components in the lab design, the study presented the simulation approach by Proteus. This software not only has simulation function of other EDA tools software, but also can simulate the single-chip computer and peripheral devices. It is the best tool for simulation of single-chip computer and peripheral devices by far, and it can greatly shorten the design time and take very good use of resources in schools.%三维CAD是数字化设计、制造和管理的基础,是现代产品创新的核心工具.本文对三维CAD技术作了简要介绍及展望.阐述了现代工程设计人员掌握三维CAD技术与科技创新的重要意义.
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