A novel fiber laser with two output ports is designed to realize high power and high quality fiber laser coherent beam combining output. The two fiber lasers associated with each other are connected by a fiber bragg grating (FBG) (R=0.85 at 1085 nm). Based on a corner-cube, the energy is mutual injected with each other. And by a polarizer, coherent beam combining output is realized. Through experiments, steady interference stripes with high contrast ratio (about 0.92) are observed and 8.6 W output power is achieved which indicate that the power combining efficiency is approximately 90%. This combining method can be scaled to a large number of lasers. Successful attempts of phase-locked show that this method may provide a promising way in the field of fiber laser coherent combining.