Carbon Fiber sheet Strengthening method (also known as CFRP strengthening method) is a kind of construction method which uses binder to paste the carbon fiberboard into the force part of the concrete member, and the matrix is folded together to achieve the reinforcement purpose. This method is usually used in the construction of concrete bridge slab, pier, beam, column, chimney and tunnel lining, such as flexural reinforcement, shearing reinforcement, and prevention of cracking and spalling. Compared with steel plate strengthening method and thickening strengthening method, the method has the advantages of high strength, light weight, easy construction and good durability, which can be used in the maintenance and reinforcement of the concrete structure with severe conditions and narrow site.