[Objective] Temporal-spatial distribution of ammonium nitrogen(NH₄⁺-N) and available phosphorus(AP) in surface soil were studied from mining subsidence slope farmland in lime concretion black soil areas. Meanwhile, the loss characteristics of nitrogen and phosphorus from surface runoff was analyzed with respect to rain intensity and slope degree.[Methods] Two surface-subsided slope farmlands resulted from coal mining were selected to sample and measure soil NH₄⁺-N and AP concentration from lime concretion black soil areas in Huaibei Plain. By simulated rainfall experiments in laboratory, soluble and particulate NH₄⁺-N and AP concentration from surface runoff were determined under two different rain intensity and three slope conditions.[Results] (1) NH₄⁺-N and AP concentration in surface soil of slope land for backfill mining were 16.5~72.0 mg/kg and 26.0~63.5mg/kg, respectively; and the corresponding values without backfill filling were 9.08~67.2 mg/kg and 22.4~82.1 mg/kg, respectively. While, NH₄⁺-N and AP content were 83.5~162 mg/kg and 38.7~86.5 mg/kg from surface soil in non subsidence areas, respectively; (2) Soil NH₄⁺-N and AP contents of the two mining-caused subsidence farmlands significantly decreased in contrast to that of the farmland without subsidence (p<0.05). The content of NH₄⁺-N was found gradually increasing from the top to the bottom of the slope there. After subsidence happened, soil NH₄⁺-N and AP concentration of the subsidence slope land did not significantly decrease as time went by, and AP content had an increasing instead; (3) NH₄⁺-N and AP loss under heavy rainfall were 3~5 times of that of weak precipitation, in which, particulate NH₄⁺-N and AP loss accounted for more than 60% of the total loss. The greater the slope is, the more NH₄⁺-N and AP would be lost. The inflection gradient of increased loss is 5°~10°.[Conclusion] Mining substance can significantly result in the loss of soil nitrogen and phosphorus on slope lands in lime concretion black soil areas, and particulate NH₄⁺-N and AP are the main ways of their loss with surface runoff in the region.