In the ecological restoration project of Qinhuangdao Qilihai wetland, dampness returning, dredging and comprehensive management of shoreline are mainly used to improve the landscape. The engineering survey was carried out in Qilihai lagoon with the water drilling sampling technique, and according to the physical and mechanical properties of soil layer, the engineering geological characteristic, the liquefaction zoning and shallow soil category are analyzed, the suitability of dredging engineering is evaluated to provide the basis for dredging and shoreline management.