The channel expansion project of Jiantan to Hengli river section is bend，and wide and narrow alternated. There are many shoals which are linked together. Sediment transport capacity of the river section is limited. Sand mining activities are very serious. So the project has high integrity and strong linkage effect with river section. According to the principle of obstruct features by rapids and overall optimization，the regulation principles of the dredging mainly，combination of renovation and dredge，controlling river regime，and stable trough are proposed. The navigation channel should be arranged along the channel deep line. Variable bottom slope design is adopted in longitudinal excavation. Trapezoid section or compound section is adopted in the transverse direction. The layout of regulation buildings should be improved. Width of regulation line should be narrow. The existing spur dikes should be fully used. New spur dikes should be built and old spur dikes should be extended. The fixed bed model test and sediment physical model test are carried out. The changes of water level，gradient and velocity along the channel after reconstruction are analyzed. The amount of erosion and deposition of channel sediment is determined，and the rationality of reconstruction measures is studied. The results show that after the regulation，the water level and gradient along the channel decrease，and the channel velocity increases. The average annual sedimentation volume is 39,800 m3. The upgrading measures are reasonable and feasible.