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The constantly improvement of communication help the technology of WEB services find its way to the power dispatching system. Gived WEB services is actively populized and applied in this field, it is necessary to develop a series of application sofewares for power system analysis based on WEB platform. Static security analysis plays an important role in power grid's security analysis. However, with the proceeding of Intelligent Grid construction and the completement of connections between regional grids, it is a huge amounts of data that operators have to deal with during their work. Now how to evaluate the fluence of any contingence to grid's operation,quickly and precisely, has become a hot issue. This paper proposes an efficient algorithm of power flow calculation based on WEB services, which could decrease the time and memory calculation takes. Then give an detailed program of on-line static security analysis. Finally take an EPRI 36 system for example to verify the program's feasibility. As the presentation shows in this paper, it proves that the algorithm and program are reliabe and precise.