In this paper,the automatic calibration system of power sensor is introduced from two aspects of hardware and software.This paper emphasizes the thinking of the software design and the characteristic of this system.The automatic calibration system is programmed under the environment of Visual Basic 6.0.It can realize some functions,such as: logging in,registering the information of the equipments,testing and producing or querying some documents.It is simple and convenient for us.Its performance is very good...