Abstract: In order to improve the useful life?of screw surface of low temperature screw presser, the WC-12%Co wear resistant coat was prepared on the surface of screw by the detoratiom spraying?process. The phase composition and microstructure of the coat were analyzed, and the microhardness of the coat and adhesion strength between the coat and the substrate were measured and tested. And the contrast wear resistant tests between detoratiom spraying?coating screw specimen and traditional screw specimen wree done and the results showed that the WC-12%Co detonation spraying coat possessed excellent mechanical properties?and the using life of the WC-12%Co detonation spraying coat reached 4.2 times the using life of traditional carburizing and quenching coat.