Under the support of GIS technique, the authors evaluated the capital stocks of the ecosystem's soil conservation with a case study in Beijing, Tianjin and Hebei Province. On the basis of the data of daily rainfall, NDVI, DEM, LUCC, and soil types of the study area, according to the Revised Universal Soil Loss Equation, the maximum amount of potential soil erosion and its actual quantities were calculated. The deviation between them was the conserved amount, which was converted into capital stocks with the methods of Shadow Price and Market Price. The result show that the value of the soil conservation in the study area was about 176.832 billion RMB yuan, which approximately equaled to the 21.41 percent of the total GDP in 2000, of which the preserved nutrient was about 167.797 billion RMB yuan and the alluvial bedload was 9.035 billion RMB yuan respectively. The contributing percent of individual ecosystems was as follows: the forest occupies 44.34%, cropland 44.91%, grassland and water 10.75%.