Abstract: In recent years, as the situation of environment becomes serious and the consciousness of environmental protection is enhanced, more strict standards for pollutants discharge were issued. The emission requirements of tail gas from sulfur recovery unit are accordingly improved, which further promote the development of the tail gas treatment process. SSR is a tail gas treatment technology with both environmental and economic benefits. The SSR technology and other four kinds of reduction-absorption technology, which include SCOT, Super SCOT, RAR and HCR, are compared. The principle, technical characteristics and application in different sulfur recovery devices are mainly introduced, and the application prospect is forecasted.