In order to improve the utilization rate of steel slag, the feasibility of adding steel slag to chip seal to replace part of the aggregate was studied. Firstly, the preliminary mix ratio of chip seal was calculated by engineering experience, and the final mix ratio was determined by laboratory shear test and pull-out test. Then, the seepage test, structural depth test and expansion rate test of chip seal with steel slag were carried out. The results show that the structural depth of chip seal increases linearly with the increase of steel slag content, and the expansion rate increases with the ...