To alleviate the hot temperature corrosion problem for the heated side pipe from the biomass incineration,and achieve the purpose of long-term pure burning/blending of biomass in the boiler,the Inconel 625 alloy coating has been prepared on TP347 substrate by ultra-high speed laser cladding technique. The microstructure and elemental segregation of the cladding layer were characterized by SEM and EDS;a self-made hot temperature corrosion setup was used to simulate the real environment of biomass incineration,and the hot temperature corrosion properties of TP347 and Inconel 625 coating were comparatively tested at 550 ℃. The results show that the optimized ultra-high speed laser cladding Inconel 625 coating has no obvious defects and forms a good metallurgical bonding interface with TP347 steel substrate. The coating is composed of fine γ-Ni phase and the precipitate on the boundary,and the hardness reaches HV341. There′s barely elemental segregation inside the coating,and the concentrations of Ni,Cr show little decrease for the bondary precipitate. For two samples,the corrosion weight gain increases linearly with the corrosion time. The weight gain of Inconel 625 coating is only 1/62 of the TP347 steel at 550 ℃ for 500 h,mainly due to its low Fe content and uniform corrosion characteristics at the interface. The Inconel 625 coating by ultra-high speed laser cladding can effectively improve the corrosion resistance of the heated side pipe in biomass incineration boiler.