Abstract: The contacts of contactor are connected in parallel to form a parallel contactor to realize capacity expansion operation, because the contact systems are independent of each other, it is difficult to guarantee the synchronicity of the close and break process and the stability of the holding process. Therefore, this paper proposed a synchronous control strategy based on single-pole switch: through logical processing of coil control signal of each contactor, the independent contact system of each single pole switch was controlled by correlation, so as to realize the synchronism fixed-phase closing action of each pole contactor and zero-current closing action. By detecting the current transfer phenomenon in the breaking process of the parallel contactor, the breaking sequence and breaking time were identified online, and the breaking sequence was dynamically adjusted; Following the change of breaking time of contactor, the breaking time was adaptively adjusted in the set zero-current breaking region. In the holding process, in order to prevent asynchronous malfunction, normal and abnormal coil current control modes were designed. Took the working condition of contact as the feedback adaptive adjusting coil current control mode, which changes the single energy-saving operation control mode in which the coil current remains unchanged during the holding process, and realize adaptive synchronous stable holding of parallel contactors. Related experiments verify the effectiveness of the control strategy.