Abstract: In view of problems of separation of drawing and calculation, setting calculation lagging behind change of field power system existed in traditional power supply design system of mining area, the paper proposed a design scheme of power supply design system of mining area based on AutoCAD. The system uses embedded VBA of AutoCAD platform to make secondary development, and compiles program to extend functions of AutoCAD to realize integration of drawing, calculation and file management of power supply design by one software. The actual application showed that the system has characteristics of good interaction, convenient operation and high reliability.