Abstract: Limestone-gypsum wet desulfurization is used in coal-fired power plants widely. This device would generate some wastewater which contains much pollutant. In recent years, more and more zero emission roadmaps of desulphurization wastewater disposal has been developed, and many demonstration projects have been built into operation. This paper classifies these methods into three units：pretreatment, concentration and solidification, which can be combined as one complete technology roadmap. This paper concludes the advantages and disadvantages by analyzing reliability, economic cost, and practical effect of demonstration projects, then gives out technically feasible advice for desulphurization wastewater disposal on future lager scale use in coal-fired power industry.