In order to improve the maintenance support ability of the large complex weapon system, this paper designs the associated debugging virtual training system. On the basis of introducing the basic composition, the design ideas and system function structure and key function designs and overall software program designs are discussed. By building topography and process control design, the virtual training design for system associated debugging is realized. Practice results show: this system solves the problem that the associated debugging maintenance training of the large complex weapon system is hard to carry out.