Virtual reality technology is a comprehensive technology involving computer graphics, multimedia technology, human-computer interaction and artificial intelligence. It has a wide range of applications in education, medical, entertainment, military and many other fields. All of these technologies are ultimately implemented by computer software. This makes the software of the virtual reality system very large and complex. The programming techniques of traditional software development methods focus on processing text data, which obviously cannot meet the needs of developing virtual reality software. Based on the successful PAR method and PAR platform of the author's R&D team, according to the characteristics of the virtual reality system, this paper explores a new virtual reality software system development method, and further expands and improves the existing multimedia processing technology in the PAR platform, the formal modeling technology and the automatic generation system of C# and other high-level language programs.