Since reforms and open policies were initiated,Nanchong city has been constructed as a center of northeast Sichuan Province by modifying its old districts and selling its land. However,the caused soil erosion is so severe that it restricts Nanchong city's developments.Analyzing the human factors resporsible for soil erosion in Nanchong City,the author pointed out the following three reasons-vegetation destruction caused by farming,encroaching farm land for urbanization and setting up many infrastructures.Based on above analyses,some suggestions are given that we should heighten public awareness,and restore vegetation and wetlands.For the sustainable development of the city,the suggestions should be implemented by enhancing administrative management and propagandizing viewpoint that plant more local trees in the city.