In order to achieve the access of multi-distributed generation and efficient and reliable power supply, the microgrid can be divided into several planned sub-microgrids to reduce the complexity of control and form multi-microgrid interconnection operation. With the large-scale access of the distributed photovoltaic power generation system on the user side, the application scenario of residential multi-microgrid becomes more common. First, the typical characteristics of residential multi-microgrid from four aspects, source-load, structure, technology and operation are described. On this basis, according to the rough designing route consisting of requirement analysis, electrical design, evaluation and inspection, the general process of system engineering design is proposed. Finally, combined with the circumstances of a community, considering the requirements of security and economy, the preliminary design scheme of the multi-microgrid demonstration project is given, which provides reference value for the promotion of residential multi-microgrid.