| The paper tries to find a better method to solve the problem of analyzing riverbed evolution using geographic information system, and builds a riverbed evolution analysis system based on ArcGIS.Based on basic methord of riverbed evolution analysis and started with analyzing ArcGIS technology in spatial analysis, the paper systemically researches the method of riverbed evolution analysis.It includes: DEMYTIN spatial difference analysis solving the problem of river section analysis and characteristic terrain extract, DEM spatial analysis solving the problem of riverbed scour-silting, TIN slope analysis solving the problem of river slope risk analysis.Closely combined the methord of riverbed evolution analysis with the ArcGIS Engine technology, the paper researches the design and integration of riverbed evolution analysis system. It includes: the management of river channel terrain data, the visualized expression of river channel terrain and models of riverbed evolution analysis. Especially it researches 3D expression and render of river channel terrain, 3D modeling of complex river project substance using the 3D technology of ArcGIS Engine. Based on the characteristic of ArcGIS Engine framework, the paper also researches encapsulation of ArcGIS Engine function in the progress of system development to improve the efficiency.The results show that ArcGIS technology shares a well-knit point with riverbed evolution analysis. It has bright future in application to analyze riverbed evolution using geographic information system because it can solve many problems in the analysis of riverbed evolution systemically. And to explore th e system of riverbed evolution by ArcGIS Engine interfaces has outstanding advantages. It not only possesses advanced technology but also solves the problems flexibly which can satisfy to professional needs to a great extent. And ArcGIS Engine has more wide application potential in riverbed evolution analysis because of its powerful function.
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