There are many continuous branching channels in Dajian channel of Minjiang River，in recent years，due to the influence of sand mining，the shoals and channels evolve frequently，and the channel conditions deteriorate year by year. In this paper，the hydrological and topographic data of Ma’anshan-Luobosi continuous braided shoal group reach in recent 10 years are collected and collated，the evolution characteristics and influencing factors of the bars and channels are analyzed，and the change process of navigation-obstructing characteristics of the shoal section，as well as the change trend of riverbed evolution and channel conditions are revealed. The results show that the split ratio of the main branch decreases year by year after large-scale sand mining in the branch，which leads to the siltation of the main channel，and that the continuous branch junction zone in the transition section affects navigation due to the dispersion of flow，fine sediment and complex changes in the shoal and channel，which must be supplemented by treatment measures. After the “8.11” catastrophic flood，the diversion ratio of the left branch of Laojiangba continued to decrease，the collapse trend of the beach head of Wangbazi intensified，the intersection zone of continuous branches was easy to form staggered shoals，and the waterway condition showed a further deterioration trend.