Abstract: Growth model-based decision support system(DSS) for crop management is the tool to help users make decision by simulation experiments and strategy analysis on the basis of crop growth model, DBMS and strategy evaluation system. Application of web technology to DSS is becoming a major direction for development of DSS in agriculture. Based on the stand-alone growth model-based decision support system for wheat management and the four-layer web structure of "Web browser/Web server/Application server/Database server", a growth model and web-application-based decision support system for wheat management(GMDSSWM^w) with good compatibility, arrangement and security was developed by using the techniques of object-orientation, COM+ component and web application. The implemented system can be used for evaluating individual and comprehensive management strategies based on the results of wheat growth simulation under the web service environment. The test and application of the system showed that the GMDSSWM^w was realized with proper functions of long-distance prediction, decision-making and dynamic regulation, thus providing basis for establishing web-based digital wheat farming system as well as other crops' management systems.