Under the new water and sediment regime, the uncertainty of the change of the bifurcation ratio of the middle branch of Emeizhou branch in the lower part of Anqing will affect the change of the bifurcation ratio of the left branch and the stability of the main channel condition.The function of water fording project in Mawo area of the left branch may be affected due to the siltation of the riverbed near the confluence of the branch in the near future. Integrated with Planar two-dimensional hydrodynamic model and based on the latest field observation data of water and sediment, this paper analyzes the periodic evolution characteristics, influencing factors and water flow characteristic of Emeizhou branch in the lower part of Anqing, and puts forward corresponding suggestions for the future management direction of Anqing reach. The results show that the swing-amplitude of the deep lake in the branch of Emeizhou is relatively small in recent decades, and the river regime remains relatively stable except for the branch point of Emeizhou, near the head of the right branch and the local reach of the middle branch. After the use of the Three Gorges water storage, the left branch of Emeizhou has been slightly washed, and the current of the right branch of Emeizhou will continue to maintain the trend of siltation shrinking in the near future, and the north and south branches of Emeizhou will continue to rise and fall each other. It is suggested to pay close attention to the implementation effect of the existing Anqing river reach control project, and take relevant measures when necessary.