In order to solve the obvious corrosion at the resistance spot welding connection position of galvanized sheet smoke hood of gas-fired heating and hot water combi-boiler, and eliminate the potential safety hazard of smoke hood seal performance degradation and smoke leakage, the design and This paper analyzes the advantages and disadvantages of exhaust hood from the aspects of This paper analyzes the advantages and disadvantages of exhaust hood from the aspects of structure design, material selection and process optimization, and draws up the optimization scheme. Acid salt spray test was used to study the corrosion resistance of aluminum alloy core pulling rivet, TOX riveting and resistance spot welding. The test results show that the corrosion resistance of galvanized exhaust hood with aluminum alloy core pulling rivet and TOX riveting process is better than that with resistance spot welding. In view of the influence of manufacturing accuracy and production efficiency, TOX riveting process can be used for assembly and connection of galvanized sheet exhaust hood of gas-fired heating and hot water combi-boiler.