In order to turn the dehydration filter cake in the stainless steel tailings to be useful and harmless, the basic physical and chemical test for the filter cake were performed. The experimental research on its road performance had been done. Results show that if fly ash is partly replaced by the filter cake, the compatibility with the lime is not affected. Stabilized crush stone with lime, fly ash and dehydration filter cake as binder material has enough mechanical strength, water stability and freezing resistance， and can meet the strength requirement of highway base course. As it only drop 10% of its strength when rolled in 12h after mixing, its application property is good.