As an important role of water environment protection system,constructed wetland has developed rapidly in China and is widely used in the construction of various sewage systems.This paper systematically summarizes the development status of constructed wetland research,and summarizes the types and disadvantages of constructed wetlands at home and abroad in recent years.And for the constructed wetland,plants,matrix and other main components of the results of research and analysis.It provides technical reference for the future design,construction,operation and maintenance of constructed wetland.