Abstract: The separated layout of surface spillway and middle outlet is adopted for flood discharge monolith of Xiangjiaba Hydropower Station. The concrete pouring of middle outlet has the characteristics of tight construction period, dense steel bar distribution and difficult concrete construction etc., so the construction scheme of one-time concrete pouring and molding of the outlet floor and dam body is adopted. In order to guarantee the quality of concrete construction, a series of quality control measures are carried out for "blind area", dense steel bar distribution area and the floor of middle outlet etc.. The quality check shows that the concrete density and appearance quality meet the design requirement.