Abstract: Since the "Action Plan for Prevention and Control of Water Pollution" was promulgated,the zero-liquid discharge of desulfurization wastewater from coal-fired power plants has become an inevitable requirement for the deep wastewater treatment in power plants.Due to it simple process,higher safety &reliability and low investment and cost,evaporation technology using flue gas has become a main one in this field.Investigating the existing technologies,the flue gas evaporation technolog can be divided into three types: low-temperature flue evaporation,bypass high-temperature flue gas evaporation,and concentration and decrement using flue gas waste heat.The evaporation capacity of flue gas was calculated,the research progress of desulfurization wastewater evaporation technology was reviewed,and the process characteristics,advantages and disadvantages of each evaporation technology were analyzed deeply.It can be seen that flue gas evaporation capacity of coal-fired power plants is extremely strong and can be used as heat source for zero discharge of desulfurization wastewater.What’s more,low temperature flue evaporation is not suitable due to its vulnerability of boiler load,the combination of concentration and decrement using flue gas waste heat with high temperature evaporation or solidification is one of research directions in future.This paper responds to the national policy actively,provides a reference for selection of zero-liquid discharge technologies in coal-fired power plants and has important practical significance and application value.