The resettlement plan of the Huaihe River project resulted in an investment of 3.12 billion yuan RMB based on the organizational behavior, coordination behavior and the supervisory behavior of the government, as well as the study of the specific work supported by the post-resettlement area. The size of the resettlement area is directly related to the safety flood diversion area, and the optimal diversion ratio of the branch river determines the safety of the drawing off of floodwater. In order to study the influence of different sluice controls on the discharge in complex flood discharge, this paper analyzes the diversion ratio of the complicated branching and parallel river channel and the stability of the river channel in combination with the Huaihe River water diversion control section model test. Based on the theoretical analysis of the collected water level and flow data, the optimal sluice opening combination and branch branching of the lower reaches of the river channel are analyzed systematically at different flow rates ratio, according to the combination of different sluice opening and combined with the surface water flow. According to the combination of different sluice opening and the surface water flow, the paper analyzes the optimal sluice opening combination and branch diversion ratio of the lower reaches of the river channel under different flow rates based on the theoretical analysis of the collected water level and flow data. When the single sluice of the main branch opens in fixed degree, the diversion ratio decreases with the increase of the total discharge, and the diversion ratio of the two minor branches is basically the same, and increases with the increase of the total discharge. When double sluice control, the main branch and minor branch sluices adjust together, the main branch diversion ratio with the single sluice control, minor branch diversion ratio change from the main branch, which does not affect the other minor branch river diversion ratio. Therefore, the best sluice opening is 2/3, and the best flow diversion ratios are 76%, 12% and 12%. This optimal diversion ratio will keep the immigration area constant.