The midcourse of ballistic missile target recognition is a key segment of the Missile Defense System. The target shape is simple and its characteristic is not obvious, with more interference. But from a practical defense process, missile midcourse flight is the most suitable anti missile defense stage. Therefore its needs to study the new characteristics of the missile warhead. Based on the dynamic radar cross section (RCS), this paper researches a joint identification midcourse target method. In the actual simulation process, with the American Minuteman intercontinental missile as a model, the RCS simulation uses the physical size of the missile. According to the characteristics of ballistic missiles in the middle of precession characteristic in flight, the setting scene conditions are given. And the dynamic characteristics of RCS of the target in the scene are obtained. According to the data obtained, the mid-course target combined identification is put forward. A new feasible method for ballistic missile dynamic object recognition is proposed