Abstract: This paper studies the dynamic relations of three rigid bodies among parachute, plate and projectile of Target Sensitivity Projectile (TSP), analyses the joining mode and binding, and considers elasticity of the parachute rope. The equations are established. An example indicates the consistency of scanning characteristics and the rule between the real movement and the movement described by the model. So the model can be used in the TSP total design and scanning equipment design.

Key words: fligh t mechanics, exterio r ballist ics, parachute, target sensit ivity p ro ject ile