Abstract: Double-reheat technology represents the highest level of Coal power. It has been developing rapidly in our country recent years,but there is still no uniform pipe-blowing criterion for double-reheat boiler. Taking a 1 000 MW double-reheat tower boiler as the research object,two-section heat storage and pressure reduction pipe-blowing process was proposed. The previous section blowing superheater,latter section tandem blowing superheater, primary reheater, secondary reheater and its associated pipelines. Considering the actual situation of tower boiler, the control points of the parameters and rhythm during the pip-blowing process were explained in detail, and further suggestions for improvement were put forward for the problems encountered. Practical results show that the two-section heat storage and pressure reduction pipe-blowing process completed the purging of double-reheat tower boiler heating surfaces with high quality, effectively shortening the blowing lasting, saving the fuel consumption, which can provide an important reference for subsequent similar units.