Abstract: To ensure the safe operation of a certain flood control wall in Shanghai and sustainable development of social production, life and economy,based on the on-site investigation into the surface cracks of the flood control wall project, the method combining mechanical analysis and finite element numerical simulations was adopted and analyzed the selected most unfavorable section of flood control walls subjected to concentrated tension of sunken ships in floods. The finite element software PLAXIS was used to analyze the safety of the flood control wall. The research results showed that although obvious horizontal displacement had occurred in the wall,the calculation values of horizontal displacement at the top of the wall and internal force in the control section at both the actual ground elevation and design ground elevation were all smaller than those of theoretical allowable values of displacement and internal force. In other words,the flood control wall was still integrated and kept in good operation.