Different constructed wetlands were compared in the aspect of technology type, treatment effect and economic benefits. Constructed wetlands are applied in recent years, this paper summarized the significant progress of constructed wetlands being treated with urban sewage, polluted rivers, eutrophicated water bodies, rural domestic sewage, cultivating wastewater, urban surface runoff, industrial wastewater (papennaking wastewater, oil -field wastewater and mining effluent) and other wastewater. It also discussed the basic technology and origin...