ln this paper , the simulation method of generating complex sltuation in the air is brought forward, according to the fact that radar intelligence used in the construction of radar intelligence automation system in our army , can not meet the needs of system performance testing and operation training. The design principle of simulation system is given. The emphasis is placed on target track , with the mathetical model set up , moreover programming and testing realized. The result can meet the requirement. The design and realization of this system will play an important role in the construction of radar inte11igence automation system in our army.