[Objective] Hydrodynamic characteristics of runoff over abandoned slags derived from the development and construction of the Shenfu-Dongsheng coal field were studied and the relationships between soil detachment rate and hydrodynamic parameters were analyzed.[Methods] Field simulated rainfall experiment was conducted.[Results] (1) Soil detachment rate(D_r) for the abandoned slags significantly linearly increased with increasing rainfall intensity; (2) Reynolds number(R_e) for the abandon slags generally increased as rainfall intensity increased, but its increase with rainfall duration showed an increasing trend at first and then maintained a stable trend. However, rainfall intensity did not affect Froude number(F_r) significantly. The F_rfluctuated violently 12 min after runoff generation and then fluctuated around a constant value. The drag coefficient(f) presented an increasing trend with rainfall duration, but the effect of rainfall intensity on the f was not significant. The abandoned slags studied, in order of decreasing average drag coefficient for a single rainfall, were the slag with less sand and more stone, abandoned soil body and slag with more sand and less stone; (3) The averaged soil detachment rate for each of the three underlying surfaces was a significantly linear function of shear force(τ) and stream power(P).[Conclusion] For the different types of underlying surfaces in the studied area, the variations of hydrodynamic parameters of runoff induced by single rainfall have their own characteristics. Soil detachment rate is significantly correlated with the hydrodynamic parameters.