A series of dredging , hydrologic data and topography in situ measurement are collected to study the implementation effect of the YH101 project . The results show that : ①After the implementation of YH101 project , the hydrodynamic force is enhanced and the main channel is eroded in the North Passage . ②Within one year after the completion of YH101 project , the large-scale waterway dredging has been implemented in the North Passage , which has played a positive role to the effect of YH101 project . ③The quantity of siltation is still very large in the 12.5 m Deepwater Navigational Channel after the completion of YH101 project , it is necessary to carry out further research on measures of siltation reduction .%利用12.5 m航道开通后的现场观测资料，结合潮流数学模型的计算，对YH101工程的实施效果进行了分析，结果表明：①YH101工程实施后，北槽主槽水动力增强，河床冲刷，主要技术指标与工程前期预测基本一致，工程的治理思路是正确的，实施效果是明显的；②YH101工程完工后的1 a内，北槽实施了大尺度的航槽疏浚，对YH101工程效果的发挥起到了积极作用；③YH101工程后北槽航道的回淤量依然较大，开展进一步的减淤措施研究是必要的。
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