Diode laser is adopted to clad Co-based powder mixed with meso-porous WC with the same size range on H13 steel. High-performance coating is obtained with the help of meso-porous WC. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction analyzer and micro-hardness tester are used to study the microstructure, element distribution, phase composition and microhardness of the coating, respectively. The high-temperature wear testing machine is used to test the wear resistance of the cladded layer at room temperature and high temperature for a comparative analysis. The results show that the cladded layer is mainly composed of γ-Co and carbide hard phases WC, Cr3C2, (Cr,Co)23C6 and Cr7C3. Due to the dispersion strengthening and solid solution strengthening effects of meso-porous WC particles on the cladding layer, the hardness of laser cladding layer increases by 2 times approximately when compared to that of the matrix. Because of the effect of carbide hard phases, the wear resistance of the cladded layer at 600 ℃ increases by 3 times related to that of the matrix H13. Oxidative wear is the predominant high temperature wearing mechanism of the coating. With the temperature rising, the oxide film forms on the surface of the cladded layer to protect the coating from high temperature erosion effectively. So the wear resistance of the cladded layer improves with the increase of temperature.