Based on the enviroment of the Nandagang Wetland, combining the outside investigation and inside analysis,adopting the mathematical analysis methods such as the principal component analysis(PCA),regression analysis,correlation analysis etc. the type of wetland ecosystem,the flora of the wetland plant, the type, the function, the formation and succession and the outside influencial factors of the vegetation, the ecological conditions and biomass of the reed population are all studied. The main re...