Considering the appealing transmission feature of planetary gear, this study presents a new electronic differential system (EDS) for electrical vehicles. The electronically-controlled transmission (E-CVT) of rear-wheel speeds regulation can be easily realized by the kinematic analysis of planetary gear. For EDS, simultaneously maintaining the trajectory and rear-wheel speeds in uncertain environments is also an essential problem. Therefore, a synchronized motion control structure is employed such that the synchronized speed error is reduced and the desired speed differential is achieved. The simulation results are given to validate the performance of the synchronized motion control for the dual E-CVT system used in EDS.