The river water quality in China is usually evaluated by conventional physical and chemical parameters,little concern of pathogenic microorganism index,though pathogenic microorganisms have significantly influence on the river water quality.Literature data indicated that major river watersheds in China had been affected by microbial contmination to some degree,especially rivers supplied by nonconventional water source such as secondary effluent of wastewater treatment plants (WWTPs).As an cost-effective treatment technology,constructed wetlands is widely applied in the advanced treatment of secondary effluent of WWTPs.