Abstract: There are a great number of problems with the integration process between crop models and GIS, such as duplicated function development, model sharing difficulty, and limited geographic processing online integration capabilities, etc. Web service composition framework for regional applications of crop models based on service-oriented architecture(SOA) was designed in this paper. The development process, interface design and implementation method about model computing web services, dynamic thematic map web services and spatial interpolation web services were illustrated by using ArcGIS Service and Model Builder as development platform. Combined with rich client technologies, the wheat production and management support prototype system based on service-oriented architecture and WebGIS (WPMSS-GISOA) was developed. The functions of map data uploading and publishing , weather and soil data querying, wheat planting design, spatial interpolation analysis, and so on were realized in this system. Functional test indicated that the web service composition framework for regional applications of crop models based on service-oriented architecture and WebGIS was feasible, which provides a reference for online seamless integration between crop models and geographic information system.