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Based on the analysis of spatial data structure of GIS (Geographic Information System), this paper describes the model of the electrical equipment in distribution network combined with the characteristics of electrical model. In this paper, the distribution network topology model which is based on GIS is studied. Moreover, detailed data structures are given. A topology analysis method is proposed to establish the distribution network model; the connection between electrical equipments can be generated automatically according to the terminal position of equipment primitives. On the platform of uDig which is a cross-platform and open-source desktop application framework, the topology data is organized and modeled. Software of DMS (Distribution Management System) which is developed based on this model can run on different operating systems. It solves the problem that DMS usually cannot cross-platform.