The Bulunkou-Konggur hydropower station is located in high altitude and filed stress area. As one of the biggest steeply inclined shaft among the shafts having been built and being built in domestic at present.The engineering construction is very difficult. The technology of inclined shaft is followed by the pilot shaft construction and then the expanding excavation. Through technology research and improvement, the construction method of inclined shaft expanding excavation in whole section bottom-up drilling blasting was used, which ensured the security, quality, progress and economy of construction inclined shaft, and the smooth completion of diversion inclined shaft. Unitary analysis and engineering practice show that the inclined shaft technology of expanding excavation has the advantages such as small investment, simple equipment and technique and easy operation.