The work aims to obtain stress characteristics of the interface between fusion bonded coating and substrate by virtue of finite element simulation, then further acquire mechanical property compatibility of the fusion bonded coating to the substrate. ABAQUS finite element software was used to slice model along the axial and radial direction, stress distribution rules of the interface between nickel base alloy and the substrate shaft under different torque loads were discussed, and the effect of coating thickness on the stress at the interface was analyzed. According to stress changing curve of the sampled nodes, the internal stress change of the substrate and coating was uniform. The stress on the interface between the substrate and coating was subject to sudden change. The stress on the coating was higher than that on the substrate. The maximum stress reduced by nearly 18 MPa as the coating thickness increased from d1=0.5 mm to d2=1.0 mm; the maximum stress reduced by nearly 1 MPa as the coating thickness increased from d1=1.0 mm to d2=2.5 mm; the maximum stress reduced slightly after the coating thickness exceeded 1.0 mm. Maximum stress difference Δσmax between coatings on both sides of the interface and the substrate interface reduced with the increase of coating thickness. More obvious changes were present when the coating thickness was less than 1.0 mm. Stress at the bottom of the interface reduced slightly with the increase of coating thickness. Sudden stress change is present at the interface between the coating and substrate. The maximum stress is present in the center of outer surface of the coating. Increasing the coating thickness can reduce the sudden stress change and obvious effects are present when the coating thickness is low.