Steel slag aggregate over 2.36 mm,steel slag aggregate over 4.75 mm and steel slag aggre-gate over 9.5 mm were used to replace basalt aggregate,respectively,and the mechanism of impro-ving its anti-sliding performance was revealed.The results show that the steel slag aggregate endows the steel slag asphalt mixture with higher texture characteristics and improves the skid resistance of the steel slag asphalt mixture.The steel slag asphalt mixture with a thickness of more than 2.36 mm instead of basalt aggregate shows the best roughness and anti-sliding performance,and the structural depth and friction coefficient increase by 9.71％and 47.5％at the highest.Considering that there is no obvious difference in performance improvement between replacement of 2.36 mm or more and re-placement of 4.75 mm or more,it is suggested that the optimum content of steel slag aggregate should be defined as replacement of basalt aggregate with steel slag aggregate of 4.75 mm or more.
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