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This paper discussed the key technologies for building a Geospatial Information Grid service workflow and describes the design and implementation of a Grid GIS service integration and hybrid invocation prototype framework: the MapGIS Grid Workflow Framework (MGWF). First, we discussed the WSRF based GIS function encapsulation details for legacy GIS system. Then we researched on the Grid GIS services dynamic monitoring and discovery mechanism and did some modifications to the Globus Toolkit 4 MDS (The Monitoring and Discovery System) tool to make it fit to our workflow framework better. The service integration and hybrid invocation mechanism in our prototype framework was described in the next part. Finally, we introduced the three main components of MGWF: a simple but visualized, easy-to-use Grid service workflow modeling IDE, a distributed process executor cluster and a pragmatic process template library. And we also give a Grid GIS service workflow examples to demonstrate the process of GIS workflow's composition, generation and execution monitoring.