In order to improve the surface properties of low carbon steel, Ni-base powders added certain amount of B4C were surface brazed on low-carbon steel. On the basis the effect of content of B4C on the performance of coatings was studied. The result shows that the smooth surface can be formed under reasonable control of the process parameters and the coating integrated with the substrate together well by metallurgical bonding; Moreover, with the increasing of the quality score of B4C particle in nickel-based alloys, the hardness and wear resistance of the coating is gradually increasing at the first, but to a certain percentage, the metallurgical combine effect is becoming poor at the same time existing some defects such as pore, furthermore the hardness and wear resistance decline.