On the basis of considering the actual situation of regional power grid, this paper deeply excavates the distribution network data of production management system, dispatching automation system, user power information acquisition system, meteorological information system and full-service data center of distribution network, puts forward the reconfiguration method of distribution line topology based on CIM, and puts forward the automatic implementation of the status quo of medium and low voltage distribution network. The specific thinking and implementation steps of diagnostic analysis. In view of the main problems existing in the distribution network, such as too large power supply radius, too small line diameter, too many segments, redundancy of connection, etc., the transformation measures of the specific problems of taking line as unit and transforming distribution into node are generated. The validity and feasibility of the proposed model and method are verified by the calculation and analysis of a city"s power grid.