Abstract: There are no key-ways made in the upper longitudinal joints in Fengman Dam and no grouting before impounding. Poor binding in horizontal joints, a variety of cracks are existed in dam body. All those will have a certain effect on its integrity. Fengman Dam has been reinforced comprehensively since1987, so its integrity has improved and strengthened. Many companies have been charged to study its integrity. This paper introduced the all results from different companies and made an integrated analysis on it.?