The work aims to study the law of influence of different solution temperature on microstructure and mechanical properties of surfacing. Solution treatment was applied to Inconel625 surfacing layer at 850 ℃, 910 ℃ and 980 ℃, respectively. The microstructure of surfacing layer was observed and surfacing layer elements were analyzed with metallurgical microscope, SEM and EDS. Hardness of the layer was tested as well. The results showed that there were Widmanstatten structure, Martensitic layers, and content of alloying element varied significantly around surfacing weld line. High concentration difference between substrate and deposited metal resulted in an extremely uneven hardness distribution. After different heat treatment, Widmanstatten structure was eliminated, Martensite layer also gradually disappeared as the temperature increased, the distribution of alloying elements became uniform. The content of Ni, Cr and Fe in the diffusion zone changed to 36.14%, 28.31% and 18.27% at 850 ℃. Compared with the content of alloying element in surfacing state, the content of Ni, Cr and Fe in the diffusion zone changed greatly, and the element distribution was the most uniform at 980 ℃. In alloying elements, the content of Ni decreased by nearly 16.27%, the content of Cr decreased by nearly 8.32% and the content of Fe increased by nearly 37.76%. Untreated hardness from the dressing to the substrate first decreased and then increased (V trend), sample hardness at 850 ℃ and 980 ℃ tended to be uniform, hardness of heat-affected zone was 24HV and 32HV, respectively, obviously higher than that of untreated zone. After heat treatment, microstructure and element distribution of surfacing layer become uniform, and hardness tends to be linear. With the increase of solution temperature, the content of elements in each zone decreases gradually, the curve transits smoothly and grain size increases gradually.