Abstract: A mathematical model of an experimental system for refrigeration is established and analyzed. On this basis, then a software with Visual C++ for the computer simulation is developed. In the environment of Windows 95/98, the C language is successfully introduced into the Visual C++ program. The working process of the refrigerating cycle can be vividly shown through cartoon. The software also includes an automatic Query and Answer CAI library, which provides the professional questions about the refrigeration system. The simulation results match the real system very well. The software has high value for engineering, and the interface is friendly and easy to use.