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Data exported from distribution GIS has become a challenge to distribution system planning and evaluation for its huge consumption of running time to finish a calculation program. In order to solve this problem, this paper proposes simplification method to reduce scale of GIS exported data. In this approach, a typical distribution network can be described by four data structure models, which are original model, whole model, primary feeder model and skeleton model. The data scale of these four models is descending respectively. Further, the simplification methods for each model are also discussed. The practical data simplification of part of distribution network in Beijing, China has shown that the proposed method can reduce the amount of data significantly. At the same time, simplified data is very close to the original ones. The proposed simplification method and its distribution model of four levels have been successfully implemented in a software system in Beijing Electric Power Company.