The hilly region of the central part in Sichuan basin is one of the regions with the most serious soil erosion in China. The research on evolutional laws through time and space on the soil erosion is highly important to the work of the soil and water conservation in the hills. This paper deals with those laws and macroecomic analyses of the region. and puts forward control measures. The auther holds that the research and management on gullies is improtant to the work of the soil and water conservation in the hills.