Abstract: Groundwater model is a key tool of groundwater management.It is widely used in the field of groundwater management.According to standard J2EE and satisfying expandability and maintainability of software and high rate of code reuse,this paper uses the frame of middleware technology style as a base and three-dimensional groundwater models as a core,adopts MVC software design model,develops groundwater simulating middleware,establishes Web-based groundwater modelling systems,and uses the WebGIS technology visualization of groundwater simulation.By using this system model,building period is shortened and the model running efficiency is enhanced.