Abstract::Combined with the construction of intelligent dispatching and control system for main and distribution network and based on the integrated model center,the main network and distribution network model and data splicing are completed,and online verification system for loop - closing operation of distribution network is established. The proposed system is applied for the feasibility analysis and risk assessment of loop - closing operation. The online verification system provides the calculation of loop steady - state current and inrush current,N - 1 safety analysis and breaking capacity scanning,which reduces the risk of loop - closing operation.