Abstract: Tools such as agricultural grass cutter, stubble blade, soymilk blade and grain crushing knife would get passivated gradually during using and could not self-sharpen. In order to resolve these problems, the mixed Ni-based alloy and WC powder was brazed on the 65Mn steel surface to make the single-sided coating of tool. To ensure that the single-sided coating tool can self-sharpen, different heat treatments were used to change the matrix microstructure and regulate the both sides wear resistance of the tool. After 100-hours-grinding tests, the edge curvatures of the samples treated by normalization, quenching and tempering are 500 μm, 120 μm, 147 μm, respectively. The tool after 400 ℃ tempering has excellent wear resistance, self-sharpening, so it can significantly improve the service life of the tool.