The flap movement makes important effect in phase of Aircraft taking off、landing and cruise. More pairs of inboard、outboard flaps at Aircraft will product different cone movement round different axial movement respectively. Design and arrangement to different actuators of each pair of slap must be used due to ensure every inboard and outboard flaps some movement step and parameter calculates of actuators movement are used. These projects are very key、very complex and every difficult in design. The flap actuator kinematics calculate method of model civil aircraft trailing edge flap are introduced and same movement step error analysis of inboard and outboard flaps is described in this paper. These calculate method and results have succeed applied on Aircrafts.