Surface composites of 7 mass % Mn steel with cast tungsten carbide particles were developed in this study. The wear-resistance was investigated by pin disk method. The results showed that the composites have excellent wear-resistance than white cast iron and high chromium cast iron. Wear-resistance increased with the decrease in the particle size of cast tungsten carbide, abrasive SiC and wear load. The wear mechnism of the surface composites was grinding and surface brittle falling of the carbide particles with repeated stress. Matrix is strengthened with the dissolution of the carbide and the addition of ferro-chrome particles to matrix. This was an important reason for the excellent wear resistance of the surface composites.