This study is to develop manual for diagnosis, repair, and strengthen of facilities such as bridge, tunnel, dam, buildings. In this study, we analyzed diagnosis report and maintenance literatures and drew up the frame and content of manual on the basis of inquired data. This manual consist of 4 chapters - condition change and repair and strengthen work and repair and strengthen example, and related organization link. Consequently, this manual will give convenience and development of maintenance work to user for maintenance of facilities.