| The city development changes with each new day, many newly built plots massive appearances, the public transportation line also day after day increases. Went on a journey for the people has brought the enormous convenience, but as a result of the city scale unceasing development, chooses for the people goes on a journey rides in a carriage the line to cause the certain difficulty, specially in the traveling city, the tourist is riding the public transportation vehicle hour choice line quite to be difficult. Therefore, the development intellectualization city public transportation information inquiry system is extremely essential. It not only may give the resident the tourist to ride in a carriage provides the guide, at the same time may foreign unfold the city the modern style, manifests a city public transportation information digitization and the becoming an information based society level of development.This article elaborates the domestic and foreign Intelligences Transportation System research and in the application present situation foundation, union general Geographic Information System development pattern, analysis public transportation network and most superior way algorithm. Route analysis is one of the most general and basic function in GIS. Its key content is the optimum route analysis. In this paper, the main content was the application of optimum route analysis to the public transportation. There are manyclassic algorithms such as Dijkstra algorithm to solve the problem. But it don't fit for this problem. The first reason is that it doesn't have a high speed; the second is that its result has large numbersof unuseful data. But uses based on the breadth first algorithm, in only considered one to two time trades while the actual situation in, can the effective realization most superior way inquiry. Base on this algorithm, develops the procedure under the MapInfo platform and some modules according to the real data of ChangSha have been obtained.
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