During the different stages of anti-seepage engineering using geomembrane, the defect is almost inevitable. According to many related literatures at home and abroad, the paper introduced some detecting methods of geomembrane defect including the examining and monitoring. In particular, the advantages and disadvantages of various detecting methods and their application scope were analyzed and evaluated in detail. After summarizing the applicability of various detecting methods, the paper lists the various repair technologies of geomembrane defects during the different stages of anti-seepage engineering. The study indicates that, compared with other detecting methods, the electrical method has strong applicability, high accuracy, and easy operation, which will attract more attention and development in the future. The combination of the electrical detecting method and the relevant defect repairing will be helpful for the forming of an effective prevention system of the geomembrane defect and the integrity improvement of geomembrane impervious system.