Abstract: In order to promote the application of CFRP in the reinforcement of brittle fracture of timber structure, the paper proposed a U-shaped CFRP at the end and carries out the experimental study of type II fracture under orthogonal design conditions, which mainly takes into account the effects of crack length, specimen height, specimen width, specimen thickness and the number of CFRP layers. It was found that the U-shaped CFRP at the end could better retard the type II fracture characteristics of the wood and caused the load-displacement curves to show an obvious transition phase of fracture failure. In addition, the results of orthogonal parameter analysis showed that: each factor has a significant effect on the critical load and fracture toughness, and the thickness of the critical load and the number of CFRP layers on the fracture toughness of the most significant, in which the increase in thickness increases the bond area of wood and CFRP, thereby increasing the critical load, and the fracture toughness with the increase in the number of layers of CFRP increases and tends to be relatively stable, it is recommended that the actual engineering applications should be in the determination of the bond area of CFRP, under the premise of the comprehensive consideration of the CFRP bond area. It is suggested that in the engineering application, the number of CFRP bonding layers should be considered comprehensively under the premise of determining the bonding area, to obtain a repair and reinforcement method with good performance and less consumables.