Abstract: The concentrations of microbe content, negative-ion and the temperatures, humidities, noises were monitored in 9 sample points in Zhenhai ecological forest belts, combined with the quantitive analysis of pollutants contents and dust accumulation abilities in the leaf samples. Based on these data and by applying the methods of substitution of the expenses, and shadow project, the ecological services of forest ecosystem in Zhenhai District were evaluated. The results showed that in 2008, the total value of ecological forest ecosystem services in Zhenhai District was 1.652 8×108 yuan. The sequence of the service function values was as follows: atmosphere environmental purification＞water storage＞temperature regulation＞C fixation and O2 release＞biodiversity conservation＞provision of forest products＞soil conservation soil conservation. Two factors which influence the evaluation of the ecological forest ecosystem services were proposed, including the characteristics of plant communities and the selection of assessment indexes and methods.

Key words: ecological forest, forest ecosystem, ecosystem services value, evaluation