Abstract: It comprehensively analyzes the typical problems such as pulverized coal pipe blockage and reheat steam temperature deviation in the commissioning stage of a new supercritical once-through boiler,and puts forward the corresponding solutions. Through the commissioning of relevant equipment, it preliminarily masters the operation characteristics of boiler and auxiliary equipment. It provides a reliable basis for the safe operation of units in later period,and provides technical reference for the commissioning of similar boilers.