Ithas not found a complete system of theory on wetland science in the world. In this paper,wetland science was defined that: wetland science is a science to study formation and evolution law about wetland system. The main achivements of wetland research of China in the past 50 years were summarized: national marishs were indagated; lot of research results were made; some fields such as wetland system, wetland and global wetland classificationet al, start to join in front of international
research. Eight importante objects of wetland research were presented in the paper: law of region difference of wetlands; formation mechanism and deposition motivity of wetland; inland selt wetland and development of West China, reconstruction of wetland environment; sustainable development of wetland and founding national research institution and pubishing wetland journal.