The flexible interconnection technology based on soft open point(SOP)brings great changes to the construction and operation of conventional distribution networks. The paper focuses on the key issues of SOP based flexible interconnection in a smart distribution network. The technical concepts

characteristics and advantages are introduced in detail. The future typical application of SOP in a smart distribution network is analyzed. The research and development on SOP based flexible interconnection technology is forecasted in key aspects as operation optimization

fault recovery

optimal configuration and equipment implementation. This work is supported by National Natural Science Foundation of China(No. 51307116)and Specialized Research Fund for the Doctoral Program of Higher Education(SRFDP)of China(No. 20120032130008).