Review of the researches on utilization of farmland drainage as resources

The utilization of farmland drainage as resources plays an important role on increasing the utilization ratio of irrigation water resources, decreasing the leak of chemical fertilizer and insecticide, preventing the pollution of agricultural drainage on water body, renovating the ecological environment and promoting the sustainable utilization of water resources. Based on various researches, the practical research, basic research and technique measures are analyzed. And the further study and the unsettled problems are put forward.