Abstract: When I inspected a gas and steam boiler, it was found that the parts on the water side of the boiler had serious localuniform corrosion and pitting, The pipe is corroded and perforated. A large area of ulcerate pitting occurred on the outer surfaceof the shell beneath the insulation layer. I encountered more problems of boiler corrosion, the boiler the situation is quite typical, the corrosion reasons are analyzedhere, and some Suggestions are put forward in the hope of providing some help tothe boilers with similar problems.