According to the General technical requirements and takeoff and landing demands for high lift devices on large aircrafts, the overall design process on high lift devices is determined. This paper introduced mechanism design method and platform building for the Trailing Edge High Lift Device in detail, and solved the complexity mechanism design for trailing edge high lift devices space and movement continuity and synchronization for inboard and outboard trailing edge flaps. The driving mechanism and retraction/ extension mechanism on the trailing edge high lift devices are completed to deploy on the rear beam ,which ensure retraction/ extension mechanism to deploy along the flow.