as the carrier of Chinese history and culture, cultural relics and ancient buildings have witnessed the development of China"s national culture, technology and history, and are known as “History books of wood”. This paper analyzes the objective safety situation of cultural relics and ancient buildings and the subjective safety environment in the process of repair, and studies the common subjective and objective safety problems faced in the repair of cultural relics and ancient buildings. The feasible and specific security measures are put forward to provide safety management reference for the repair of cultural relics and ancient buildings in the future, and realize the protection and inheritance of architectural heritage.