Abstract: The innovated target of modern irrigation technology was sustained national and regional food-safety strategy. It was changed to the compositive effect that included hydrological circulation, water save-irrigation, fertilizer and pesticide cut down, and greenhouse gas discharge, etc. In southern China, several paddy water save- irrigated technical was adopted such as thin-exposure irrigation, alternate wetting and drying irrigation, sun-drying field, and crop pattern turn from paddy to drying-farmland, and so on. Then, countryside water environment comprehensive harnessed includes channel and drainage arrangement, pond and wetland designing, to purify sewage and decrease contamination discharge through those stages of plant assimilate, water flow self-pure, pollutant deposit, and man -clear desilting, etc. At last, the engineering practice in Yunnan Province was taken, to reveal the reasonable method and problems encountered.