Abstract:Roof maintenance and repair of historic buildings are very important. In order to study and refine the effective repair technical measures in related engineering projects and guide the same type of engineering practice, the repair technology and construction methods of the roof of historic buildings in Inner Mongolia were discussed by using the methods of field investigation, literature research and case analysis. The study found that the renovation and maintenance of historic buildings should maintain their original practice and appearance as far as possible, and the technical measures taken to repair the roof depend on the roof material, structure and construction method, and the types of damage and pathological diseases should be analyzed to put forward targeted programs. This study is based on more than 10 roof repair projects in Inner Mongolia, and collects a large number of practical technical data, which makes the research results more practical. And it can provide guidance for the roof maintenance of historic buildings in other areas of northern China, and has important practical significance.