The stability of secondary bare slope was studied by adopting the methods of runoff sediment concentration and anti-scourability was analyzed in 6 sample plots of Sunjiawan coal-mining area in Fuxin City.The results showed that the anti-scourability existed significantly difference in mining secondary bare slope,and had the regular rules of dynamic changing.In the initial,the overall changing trend of runoff sediment concentration was larger,then sharply reduced in regular,and then stabilized.Compared with natural soil,its sediment concentration was less and decreased faster.There was an obvious power function regression relationship between the sediment concentration and the scouring time in different plots.The overall trend of anti-scourability coefficient was increasing gradually with the time.The anti-scourability coefficient in the secondary bare slope was larger than that of natural soil in the initial 10 min.The relationship between the anti-scourability coefficient and time followed the exponential equation obviously.