Abstract:The renovation of ancient buildings is different from the ordinary renovation of houses. The purpose of the renovation is not only to eliminate the unstable factors that affect the structural safety, but also to carry out an investigation and analysis of each building component during the renovation construction, we should not only follow the principle of“Repairing the old as before, not changing the original appearance”, but also pay great attention to the historical information discovered in the construction, such as building shape, material, construction technology and so on, this further study of the historical value of ancient buildings, scientific value to provide more detailed physical proof, but also for future repair to provide a full basis. In this paper, through Mencius, Mencius and Mencius three-phase renovation project construction process, survey found new historical information, the use of reinforcement, analysis of some experience.