The Tongluoxia reef-blasting scheme is demonstrated by a 2-D mathematical model.The measured surface line and the velocity distribution of Tongluoxia reach are verified by the model，and the calculation results are almost consistent with the real-measured data，which can simulate the actual water flow motion correctly.After the program implementation，the navigable channel flow conditions of the Tongluoxia reach change little when the water level equals to the design level and 2 m above the design level，the section’s average water level reduces within a small range，the average velocity profile and gradient have no obvious change，and the reef-blasting area has enough design depth;Tongluoxia reach’s flow condition is favorate，the left-side flow direction in the channel is straighter then that of the previous scheme，and the flow velocity is generally small.The channel navigation conditions are better after the reef-blasting scheme is carried out，which shows that the reef-blasting scheme is feasible.