We study the integration of Distributed Hydrology Soil Vegetation Model and GIS based on ArcObjects released by ESRI recently. Four categories of integration of DHSVM and GIS are discussed. We build a seamless integrated system integrated DHSVM and GIS by the methods of embedding. A research of watershed hydrology simulation in Lushi watershed is carried out. The case illustrates the integrated system can improve the model getparms capability, data management, process visualization, spatial analysis and so on. , which provides a power sustain for watershed land surface hydrology modeling.