The Danjiangkou Reservoir is the water source area of the MiddleRoute of the South-to-North Water Transfer Project.Wetland vegetation in the Danjiangkou Reservoir region is essential for the water transfer project.Vegetation survey indicates that there are abundant aquatic plant species and various plant communities in the reservoir wetlands. However,almost all kinds of current wetland vegetation in the reservoir shorelines will be permanently inundated and new wetland vegetation will develop at higher elevation after Danjiangkou Dam heightened. According to canonical correspondence analysis(CCA) and stepwise regression analysis based on the relationships between vegetation and environmental factors，we predict that new wetland vegetation will be dominated by Cynodon dactylon and mesophyte characterized by low species diversity in the areas of large slope,and Paspalum paspaloddes and hygrophyte are dominant species in the flat areas with relatively high species diversity.