Based on the distribution law of temperature field in the electron beam cladding process simulated by ANSYS software, the melting depth and melting width of the cross section of cladding layer were investigated, and then the dilution ratio of cladding layer was estimated through simulation. Afterwards, the electron beam cladding experiment was conducted to measure the actual dilution ratio. Through the comparison between simulated and experimental dilution ratios, it can be verified that the dilution ratio of electron beam cladding can be obtained by simulation. The microhardness and the wear resistance of specimen after cladding were investigated. Results show that the smaller the dilution ratio, the better the quality of the cladding layer.