Abstract: Land use simulation is an important methodology to study land use change. Ecological environment protection is a major constraint of land use. In this paper, we built a multifactor comprehensive decision model to analysis ecological environment. The result was imported into SLEUTH model to constrain land use change, therefore, realized a loose couple of urban growth model and ecological environment analysis and successfully simulated urban expansion on the condition of effective ecological environment protection. The model was adopted to simulate landuse in Dianchi basin. The simulated result and the actual landuse in 2005 were compared. It indicated that current land use plan had taken ecological environment protection into account, although unreasonable land use still remained. The simulated result proposed a relatively new foundation to evaluate the existing land use situation and assisted future land use planning.