The invention discloses a CAD-based bridge defect management system and a bridge defect management and maintenance method. In the system, a technology relevant to CAD is used for recording and processing defects in bridge members. The software comprises various functions, such as bridge system overhaul, defect record, bridge assessment and forecast and defect maintenance. The patent of the invention enables bridge management and maintenance units to overhaul and maintain the bridge defects more conveniently and greatly improves work convenience and efficiency.