Abstract: For algal bloom of tributaries bay in Three Gorges Reservoir area in spring, a 3D-hydrodynamic model has been established to analyze the feasibility of the peaking dispatch scheduling and tidal scheduling to promote water exchange  between the mainstream and tributary bays. The study showed that when peaking dispatch scheduling was carried out in April, the flushing time of the bay was shorter than that under regular reservoir scheduling, especially in the upstream and mid-upper areas; when the tidal scheduling was implemented in May, the flushing time in the lower bay where the water volume is larger was shorter than that under regular scheduling. So the peaking dispatch scheduling and tidal scheduling can promote the water exchange between the mainstream and tributary, namely, two scheduling schemes are feasible. The average flushing time of the bay was shorter than that under regular reservoir scheduling when peaking dispatch scheduling was combined with tidal scheduling, which could promote the water exchange of the mainstream and tributary significantly. The results can provide a reference for the water environment problem prevention and control of tributary bays.