A parallel driving structure of twin electric cylinders was applied to ensure the fast and reliable erection of a certain device. The erecting equipment is a multibody system with complex electromechanical coupling effect, and the load variation exhibits uncertainty. Aiming at the nonsynchronous problem in the equipment while the load for each cylinder is inconsistent, a masterslave(MS) synchronization control scheme with relative coupling strategy was proposed, and a rulebased fuzzy PD synchronization controller was designed. The controller adopted the position error of two cylinders as the input, and position compensation signal for the slave cylinder as output. Simulation of twin cylinder equipment was conducted under extreme partial load conditions in MATLAB/Simulink environment. The result indicates that the MS control scheme can enable the system to meet the accuracy requirement for synchronization. Owing to the use of fuzzy PD controller, the synchronization error in starting process can be effectively restrained and the effects on synchronization error caused by the load disturbance can be successfully overcome.