Abstract:The overall mechanism structure of horizontal pipes connector was designed and researched in order to implement connection of two pipes for gas-oil in deep sea. The contact property of seal ring between the two face to face flanges was analyzed, which used finite element method (FEM), and obtained permissible compress displacement of the seal ring to realize sealing. The allowable journey of synchronization hydro-cylinder in the hydraulic system was gotten. The electro-hydraulic position-servo synchronization system of connection mechanism was proposed, transfer function of symmetric servo controlling oil-cylinder electro-hydraulic servo system was derived, and simulation parameters were set. Simulation analysis of synchronization linearity of double-cylinder displacement was done, and a PID controller was applied on the system to regulate two hydraulic cylinder synchronization controls. Its coefficients of proportion, integration and differential are determined, and the error of synchronic displacement is less than 0.5 mm, that achieves the request of the control system.