Huai’an east ship lock in the Huaihe River estuary waterway is surrounded by numerous waterways,water conservancy and transportation facilities,making the construction and operation environment extremely complex.According to the navigation conditions,impact on the flood discharge of the Huaihe River estuary,impact on the navigation of the Beijing-Hangzhou Canal,impact on surrounding buildings,external transportation conditions,and land acquisition and demolition situation,it is recommended to choose a scheme of the southern ship lock position.At the southern ship lock position,according to the navigation conditions,capacity,efficiency,impact on the flood discharge of the Huaihe River estuary,impact on the flood control embankment,construction conditions,and project investment,a curved in and straight out layout plan is recommended.After conducting overall physical model tests on the ship lock,it is demonstrated that overall layout plan is reasonable.Layout plans for upstream and downstream navigation adjustment sections and berthing sections meet requirements of navigation water flow conditions specified in the code.After optimizing the length and permeability of the upstream and downstream side flow barriers,dredging of the local water area in front of Yundong sluice gate is carried out,and compensation engineering measures are taken for the cut-off of floodwaters in the Huaihe River estuary,which can meet the requirements of the ship lock’s own navigation water flow conditions.The construction of the project will not have any adverse effects on the flood discharge of the main irrigation canal in northern Jiangsu Province,the operation of the Yundong sluice,the operation of the aqueduct,and the power generation of the Yundong power station.It will have little impact on the flood discharge of the Huaihe River estuary and the operation of the culvert.