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The flap movement makes an important effect in the phase of taking off,landing and cruise. Kinematic mechanism of Rear edge inboard flap based on a certain type of plane as the research object is solved out according to pneumatic position in this paper, which is result of wind tunnel test. Carriage drived by ball screw actuator puts the inboard flap in motion, and then vector coming from wind-tunnel test is achieved by curvature change and backward travel; the calculation method described in the paper and results have been successfully applied to kinematic mechanism research of inboard flap of the plane.