The Mount Beigu wetland ecosystem has retrogressed seriously, because the wetland was destroyed and used irrationally by people. Phragmites australis and Phalaris arundinacea populations are dominant populations in the wetland, which play important role in the Mount Beigu wetland ecosystem. The growth principle and ecological function of the Phragmites australis and Phalaris arundinacea populations were studied in this paper, the objective is to provide the theoretic supervises for the wetland human-induced...