Abstract: The new distribution network system has the characteristics of multi-source, digitalization, informatization, flexibility, and interactivity. The information and physical systems involved in it are closely coupled and complex, posing challenges to the planning and operation simulation analysis of conventional distribution systems. In order to solve the above problems, in view of the fusion characteristics of energy flow, information flow, service flow and control flow of distribution network, we propose a new distribution network multi-flow fusion simulation engine based on finite state machine, construct a fusion simulation architecture based on real-time rapid simulation, and design a state interaction control scheme between physical layer, host computer and real-time simulation layer, and a state control conversion strategy within each layer. Moreover, the new distribution network fault reconstruction application scenario is taken as an example, and a fusion simulation engine is connected to select the optimal fault reconstruction path, and compared with the traditional optimization model. The simulation results show that the designed scheme can effectively combine with the new distribution network control system, achieve fault localization and reconstruction of the new distribution system through communication and control, and provide technical supports for the digital analog mixed simulation, business scenario replication, and optimized operation of the new distribution network.