【Objective】In the experiments, the mechanism of maize-peanut intercropping in increase of land productivity and water use efficiency was studied through comparing yield, land equivalent ratio and water use efficiency, and the optimal maize-peanut intercropping systems in semi-arid region of western Liaoning province were proposed.【Method】Field experiments were conducted in 2015 and 2016 in Fuxin Scientific Observation Research Stations of Agricultural Environment and Cultivated Land Conservation. Four treat...