Most of the sites of domestic waste incineration power plants are far away from urban areas,which leads to difficulties in water intake and drainage.Therefore,it is particularly important to make reasonable use of waste water,improve the efficiency of water use in the plant,and realize"zero discharge"of waste water in the domestic waste power plant.Taking a domestic waste incineration power generation project in Lanshan of Linyi city as an example,the paper analyzes the water balance diagram,economic benefit,social benefit and water quality of the waste water treatment system and"zero discharge",and makes clear the importance of"zero discharge"of waste water to the solid waste incineration power generation project.The"zero discharge"of waste water needs to combine the water consumption and water quality of each process link in the plant,and make efficient use of all kinds of waste water.Optimize the process in the plant,form a set of water balance diagram in line with its own,so as to achieve the purpose of"zero discharge"of waste water.