Based on the remote sensing data and supported by RS and GIS, the land use/cover change (LUCC) images and the ecosystem services value (ESV) change images of Yulin City during 1985-2000 were constructed by using the theory of geographic information images. According to the research on above change images, the characteristics of LUCC and its ecological effects in the study area were analyzed. Results showed that the areas of water and unused land were decreased, while the areas of farmland, forest land,rangeland, and construction land were increased in the research period. Rangeland was found to be increased fastest. The main land use change category was the transformations from unused land to rangeland , from farmland to rangeland , and from rangeland to farmland, whose areas were 79.59% of the total change. The change of land use made the ESV of the research area increase from 9.84×10⁹yuan in 1985 to 1.01 ×10¹⁰yuan in 2000. There was 86. 74 % of the total increased ESV in the northern six counties where the ESV was increased by 2.66×10⁸yuan, but there was only 13.26% of the total increased ESV in the southern six counties where the ESV was raised by 4.06×10⁷yuan. During the research period, the similar changes inecosystem service value and ecological risk index show that the eco2environmental effect of the land use changes in Yulin City is positive, but the effectiveness of ecological construction is obviously imparted by the great change from rangeland to farmland.