The Yellow River Longkou Hydro-junction is a supporting project of the Wanjiazhai Hydro-junction of the Yellow River. It is located at the tail of the Toro Section of the main stream of the Yellow River. The upper reaches of the dam are 25.6km away from the Wanjiazhai Water Control Project. Engineering tasks to power generation, at the same time anti-regulation of Wanjiazhai hydropower station. With a total reservoir capacity of 196 million m3, a maximum dam height of 51 m, a total installed capacity of 420 MW and a multi-year average generating capacity of 1.30 billion kW · h, the construction and operation of the project will play an important role in promoting local economic and social development and improving the ecological environment. We conducted a technical study on gravel aggregates, engineering design changes and optimization, rock quality appraisal of 1 ~ 10 # dam sections and power plant buildings, review of budget estimates, consultation on construction organization design proposals, and study on reservoir operation and utilization plans. Put forward a scientific solution.