Abstract: Based on experimental results of masonry walls subjected to low-cycle repeated lateral loads, this paper analyzes the strengthening and restrainting effects of CFRP in preventing the collapse of cracked masonry walls. Two factores that influence the loading capacity and deformation behavior of walls are investigated: CFRP bonding way and the CFRP reinforcement ratio. Experimental results show that the shear capacity of masonry wall depends on CFRP strain, which, furthurly depends on the wall’s lateral deformation. With different wall’s lateral deformation, the strengthening effect of CFRP is different. A simplified method to estimate loading and deformation capacity of masonry walls strengthening with CFRP is proposed in this paper, which is valid for different CFRP bonding angle and different bonding way. The optium CFRP bonding angle is discussed and an improved CFRP bonding way is suggested.