Supported by the land use/cover change(LUCC) detailed survey data of all 24 villages and towns of the suburb of Yan'an City during 1984~2002, on the basis of analyzing the feature of quantity and structure change of LUCC in the suburb of Yan'an City during 1984~2002, using the newest achievement about ecological value estimation of domestic and international scholar, and considering the concrete conditions of the suburb of Yan'an City, the authors have estimated the economic worth of ecosystem service function of the suburb of Yan'an City each year during 1984~2002, calculated the relative changes of the economic worth of the ecosystem service function on a basis of 1984, and analyzed the features of the changes during different periods and its reason. Studies have shown: Generally,during 1984~2002,the responds on environment of LUCC in the suburb of Yan'an City were positive. Ecosystem economic worth improved in general. The policy of returning farmland to woodland and grassland, as well as the implementation of inside structural adjustment of policy, realize economic and environmental anticipated result .