Abstract: Ecosystem services is the material base and natural capital of human sustainable development. Evaluating the ecosystem services value is helpful to realize the importance of natural ecosystem to human welfare. However, it is difficulty to evaluate the ecosystem services value accurately because of complexity of ecosystem, fuzziness of reactions of economic system to ecosystem, and limitations of value research. It should be studied in some deep-going ways such as multi-scale comprehensive research and dynamic participation evaluation, separation research of product value and non-material services value, investigation and simulation of marginal value, interdisciplinary studies on ecological compensation, and the market-oriented research on non-material service value.