After the completion of the Mingyuexia Yangtze River bridge,the left bank of the Hongmiaojiao reef under the bridge will affect the further improvement of the channel scale of this section of beach.In order to avoid this situation,in view of its river situation and beach situation and considering the long-term development needs of shipping in the Yangtze River,a deep reef blasting plan is proposed based on the original 3.7 m reef blasting scheme.The scheme is demonstrated by using a two-dimensional plane mathematical model,which is validated by the measured surface line and velocity distribution.The results show that the model validation is good,and can correctly simulate the actual water flow movement of the beach.After the implementation of the scheme,the average flow velocity of the section of the designed lowest navigable water level and the change of flow velocity along the path are all less than 0.01 m/s.The gradient along the distance has no obvious change,only in the upper reaches of the reef-blasting area,the water surface decreases slightly by a maximum of 0.01 m.The flow field in the reef blast area is improved obviously,the angle between the flow direction and the channel decreases obviously,and the navigation conditions of the ship are improved.