Abstract: Ditch regulation and land reclamation is an important measure to solve shortage of cultivated land reserve resources in China.Solving safety problems of water use，drainage and flood control is the key to improvement of agricultural output and high-quality development of ecological environment.On the basis of summarizing problems of water resources utilization and flood control of water conservancy facilities in loess plateau，a comprehensive water conservancy supporting technology integrating water storage，drainage，flood control，irrigation and management in gully and land reclamation basin of loess plateau was proposed.Two peak discharge calculation formulas suitable for different catchment areas were recommended to provide basis for design of storage and drainage engineering.This technology was conducive to sustainable utilization of water resources and land security of gully and land reclamation in loess plateau.