Currently a satisfying evaluation method has not been developed for the forest ecosystem evaluation yet.Based on the Costanza's method,XIE Gao-di introduced the equivalent weight factor method.In 2008,the Institute of Forest Eco-environment and Protection,Chinese Academy of Forestry promulgated the evaluation criterion of forest ecosystem(LY/T1721-2008).Taking the riverhead forest ecosystem of Qiupu River in Chizhou City,Anhui Province as an example,the two methods were applied to calculate the service value of the forest ecosystem as approximate-ly1.13×10⁸Yuan and 4.94×10⁸Yuan,respectively,in 2007.This large disagreement between two numbers could be attributed to the background behind which the methods were created,different concepts,index types and included parameters.Equivalent weight factor method was created based on conditional values,reflecting objectively the people's willingness to pay(WTP).However,it maybe not theoretically precise.LY/T1721-2008assessment method emphasizes more on theoretical application and is therefore more precise and accurate.However,its results may deviate considerably from the people's willingness to pay.