[Objective] A case research in a black soil sloping farmland was conducted to illustrate the spatial correlations among productivity

organic matter and total nitrogen content

in order to provide some hints for controlling of soil and water loss and improving of agricultural production in simliar slope farmlands. [Methods] Spatial correlations among productivity

organic matter and total nitrogen content were analyzed by classical statistics and geostatistics methods. [Results] There was no significant correlations of soil productivity with organic matter content and total nitrogen content. A insignificant negative correlation(p<0.05) between soil productivity and altitude was found. There existed a significant correlation between soil organic matter content and total nitrogen content(p<0.01). [Conclusion] The productivity of the sloping farmland was greatly affected by soil structure factors

such as terrain

groundwater level and soil forming process; about sixty-seven percent of the variance of productivity can be explained by them.Other thirty-three percent variance was affected by cultivation

fertilizer application and planting. Soil erosion was thought to be the dominated process that lead to the reduction of the black soil productivity on sloping farmland.