Study on the service values of ecosystem is the bridge of understanding ecosystem and helping economic decision\|making. Karst ecosystem faces the problem of eco\|comeback and rebuilding in the Southwest of China. Revealing the spatio\|temporal variations of its ecosystem service is urgent requirement in the process of ecological restoration and sustainable development. Through the remote images, meteorological and statistic data of many years, the spatial distributions and variations of ecosystem service were evaluated and analyzed for the typical karst area in the Northwest of Guangxi Province in 1985, 1990, 2000 and 2005. The result shows that: (1) from 1985 to 2005, total ecosystem services decreased firstly and then increased, but the value in 2005 was less than that in 1985 in general. The estimated values of the ecosystem services in above years are 1096.52 million Yuan, 887.89 million Yuan, 133.84 million Yuan, and 1062.57 million Yuan, respectively. The trend of spatial distribution is declined from west to east, from mountain to peak\|cluster depression areas. The ecosystem services in high\|value areas (the western part of the region) are decreased, while those in low\|value areas (the eastern part of the region) are increased; (2) The ecosystem services of nutrient cycling, organic production and gas regulation are high, the corresponding total ratios are 72.69%, 64.57%, 70.18% and 72.10%, respectively. While the ecosystem service values of water conservation, soil reservation and recreation and culture are low (below 100 million Yuan each); (3) Woodland and shrub are the dominated landscape types, and they are the first two large landscape types contributed to total ecosystem services. The total ratios of them in the four year are 71.22%, 70.10%, 73.66%, 6703%, respectively. The ecosystem services of residence and rocky land are very low and their total ratios are only 090%, 0.63%, 0.77%, 1.14% respectively; (4) The change of ecosystem services per unit in every county is distinct, falling from 23549.70, 173.5.10, 22705.10, 19062.30 Yuan/hm2 to 9764.71, 7689.61, 9537.01, 7540.79 Yuan/hm2. The ecosystem service values have been obviously increasing in typical karst areas, but distinctly decreasing in non\|karst areas. Our study indicates that ecosystem conditions are improving because of the application of policies regarding of rocky desertification control, such as ecological migration and returning farmland to forest.