Currently, the three-element testing instrument of missile does not have such functions as fault setting and evaluation of training effect. Furthermore, it is inconvenient for function extension and circuit maintenance, etc. To solve those problems, certain type missile testing simulation training system with complete function and advanced technology is developed based on Windows Platform by use of virtual instrument technology and object-oriented technology. This paper elaborates design ideas of system as well as hardware and software design, thereby solving such key technical problems as system interaction display, flight simulation data implementation, computer interface and system communication, etc.