Due to a little rainfall，which is discordant to supply and demand，lean soil and the long term effect of human activity，the ecological environment in the semi-arid area and semi-moist area inclined to be arid is being degraded. Soil and water loss are becoming more and more serious. Based on the investigation on the spot，the au-thors think that building rainwater catchments is an effective approach to ameliorate the ecological environment and accelerate agriculture in the small watershed. In the case study of Tiewa small watershed，the measurements and management forms of the comprehensive ways in small watershed on the background of rainwater catchment are discussed. The feasibility analysis indicates that the comprehensive ways in small watershed based on rainwater catchments fits the agriculture practice.