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This essay focus on the performance estimation of positioning performance by both BD-2/GPS and each of them independent in JiYuan region. The number of visible satellites, the geometric precision factor, the stability and accuracy of positioning are analyzed in different mode. At present, it is possible to make multi system joint localization under the development of the compatibility of several satellite navigation and positioning systems in the world. In this paper propose an idea of BD-2/GPS integrated navigation system and Mathematical calculation method based on the BD-2.The test result show that integrated navigation system improve the positioning performance of the single system mode.