Perambulation on the Taihe Palace in the Palace Museum is carried in order to protect and maintain it. During the process, some mechanical problems of its components appear as following: The maximum flexibility of the seeking out beam on the west side of the building reaches 13 cm, which exceeds the limits of the wood design standard of China; The tenon of the face beam of 3 - width part of the building goes down 10 cm; The tenon of the side beam of the 3 - width part of the building goes down 10 cm but the beam has been supported; The caissons and ceilings in the central part of the building goes down 13 cm and the Jingkou beam on it has splitted. These problems are analysed by techniques of structural mechanics and relative strengthening methods are discussed to solve them. Results of the study show that the reason the flexibility of the seeking out beam is very large is that the wood material grows old and its elastic ratio decreases, but the intensity of the beam still fits the design standard; The reason that the tenon of the side beam goes down is that its strength of bending decreases, but the problem has been solved by additional supporting; The possible reason that the tenon of the face beam goes down is that the wood material grows old and some part of its strength of extension, bending and shearing are insufficient, and steel - wood strengthening structure is used to solve the problem; The reason that the caissons and ceilings goes downs is that the wood material grows old and the strength of bending and compression of the Jingkou beam are insufficient, flat steel is utilized to strengthen it. The results of study are favorable for protection and remedy of Chinese ancient buildings.