Wetland science research has earned great attentions and wetland assessment is an important part of wetland science characterized by complex context and various assessment methods. What's more, there is not unified standard on the evaluation of wetland functions. This paper enumerates the commonly used evaluation methods for different functions of wetland both at home and abroad. The advantages, disadvantages, application range of each method and relevant outcomes were discussed, which can provide a reference for the wetland assessment in our country.