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There is no direct communication between the main and distribution network in the existing grid model of line loss management system, and the measuring role of secondary device is not full. Aimed at these problems, the proposal to construct a grid model which main and distribution network is connectivity, primary equipment is associated with secondary equipment is presented. Establishing hierarchical model of primary equipment and secondary equipment which communicate the main and distribution network by one-to-one digital modeling method, to remove the secondary workload and compatibility issues of equijoins; Designing gateway property tree of secondary equipment which establish a relationship with the primary and secondary equipment, to avoid the gateway in information systems inconsistent with the actual; the model is built in SG-CIM's specifications. After building the grid model, designing the line loss management system which follows the SOA architecture, to implement grid model's reusable management and real-time line loss management.