Cut-off wall is an important hidden project in hydraulic construction project.Some problems of cut-off wall exist in the process of investigation， design， construction， test and acceptance.Based on years experiences of engineering and analysis of examples，this paper has analyzed the current problems existing in cut-off wall.Some countermeasures such as regulation revision，perfecting policy，implementing qualification and personnel management，encourage technological innovation and research are also put forward.The results provide reference for the investigation，design，construction，test and acceptance of cut-off wall in the future．