In order to clarify the relation of river channel evolution of braided channel and single slightly curved channel in midstream of Yangtze River, it is necessary to carry out study of river bed evolution relation of Yaojianda reach( consist of Yaojian reach and Damazhou waterway) . Based on analysis of river bed evolution in Yaojian reach, the influence of incoming flow and sediment variation and boundary condition change in Yaojianda reach on river bed evolution was studied, and the relation between river regime variation in Yaojian reach and changes of mainstream, shoals, bars and navigation condition in Damazhou waterway was focused. The results showed that under the influence of riverbed evolution of Yaojian reach, the entrance reach of Damazhou waterway became meandering and narrow;the navigation condition of the outlet reach worsened.%为了弄清长江中游弯曲分汊河型与单一微弯河型演变的关联性，有必要开展荆江窑监大河段(由窑监河段和大马洲水道组成)河床演变的关联性研究。在分析窑监河段河床演变的基础上，研究了窑监大河段来水水沙条件和边界条件变化对河床演变的影响，重点探讨了窑监河段变化与大马洲水道主流、洲滩、航道条件变化的关联性。结果表明，在窑监河段河床变化的影响下，大马洲水道进口段弯曲狭窄，出口过渡段航道条件变差。
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