| Science and technology changing with each passing day has motivated the development of geographic information system greatly and brought infinitude of energy. With the mobile positioning technology, wireless communication technology, Internet technology and embedded system appearing and going to maturity, the geographic information system has had wider development space. Under these circumstances, the Mobile GIS has been rapidly developed. People obtain own position with the.mobile positioning technology on personal digital assistant (PDA), and then, obtain the geographic information of own position or change information .with other by the wireless communication and the Internet. That makes the application field of GIS wider.The paper reviews the history and status in quo of mobile GIS, and open out the wide foreground of mobile GIS application. The implement of mobile GIS requires the geographic information server, mobile equipment for receiving, mobile equipment for positioning and data communication at least. The paper particularly introduces the embedded system, mobile positioning technology, wireless communication technology and embedded GIS, which correlates with mobile GIS.The paper particularly introduces the embodying design and implement of the surveying and inspecting system for electric power establishment. The system designed using the technique of modular software designing. We disintegrate the system into six major modules that are comparatively independent one another in the function, which include the GPS controlling and signal analyzing module, the GPS difference module, the map control module, map symbol DLL module, user data management module and user message dispatch and receiving module, And then particularly introduces the embodying design and implement of each module.The paper studying technology mostly is involved in mobile positioning, electron map, GPRS, Internet, embedded software development, network communication programme, "3S" integration and so on.
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