In view of the increasingly prominent problem of cyberspace threat faced by surface-to-air missile weapon system, this paper analyzes the problem. From the air attack cases in recent years, the "cyber attack" is easier to break through the ground air defense system than the hard killing of firepower, and its operational concealment is stronger; the vulnerability and weakness of the system network security are analyzed. The results show that the analysis is of great significance for the ground air defense system to deal with the threat of cyberspace and to carry out the design research.