Carbon fiber reinforced polymer (CFRP) had recently been applied to not only wing, but also fan blades of turbo fan engines. To prevent impact force, leading edge of titanium was often mounted on the CFRP fan blades by adhesive force. In order to enhance the joining strength, we suggested a joining method with carbon fiber reinforced interface. By using nickel coated carbon fibers, we successfully developed a joining sample with carbon fiber reinforced interface between CFRP and CFRM. The joining sample with nickel coated carbon fiber exhibited the high tensile strength, which was approximately two times larger than that with non coated one and was also more than 11 times higher than that with conventional adhesion.