According to the series and parallel structure of multi-microgrid system，a two-level hierarchical control scheme is designed for multi-microgrid system with series and parallel structure.Based on the available operation states of multi-microgrid system，a scheme of operation state transition is formulated in its current operation state and trigger event.Then the microgrid central controller（MGCC）coordination strategy between multi-microgrid with series and parallel structure for the tie-line power control and mode switch of multi-microgrid system is proposed.By referring to the construction of the smart microgrid of Yunnan Electric Power Science Park，the MATLAB/Simulink software is used to build the multi-microgrid system with series and parallel structure.The dynamic characteristics of tie-line power control and different operation status switching and synchronizing are analyzed.The results verify the effectiveness and correctness of the proposed control strategy.