Abstract: Ecosystem services evaluation has attracted much attention for its role in guiding agreen strategic decision and public action.Because of its easy application, Xie G D's equivalent value per unit area of Chinese ecosystem services(ESV)has been widely used. However, aprecise revision is the precondition of accurate assessment result.The phenomenon of researchers not paying close attention to equivalent revision as much as the assessment result analysis makes the authors probe into a high resolution revision method of ESV, so that it can be more widely used in other regions and accurate in detecting changes. The revision method can be summarized as follows:(1)region revision, revise the average ecosystem service equivalent value of the whole country into that of the study area, by using the data of per unit area value of food products.In consideration of the complexity of forest ecosystems, biomass of each type of forest ecosystems are used to revise the equivalent value in quality.(2)grid revision, apply vegetation coverages based on vegetation index(NDVI)to correct the equivalent in quantity, which shows the variance of ecosystem service among units in the same land use type under different vegetation coverage at the grid cell of 1km².These intersected multi-scale revision downscales ESV from national to local to grid cell, which not only keeps ESV comparable at different scales, but also detects the spatial heterogeneity in details.This method was applied in counties along the Bohai Bay to study the distribution and changes of ecosystem services between 2000 and 2008.The approach is more practicable and suitable in comparable analysis between different years and distinguishing the intensity of ecosystem services at inner-regional scale.

Key words: and use/landcover, ecosystem services, region revision, biomass, grid revision, vegetation coverage