Abstract: Coherent beam combining of fiber lasers is an very effective way to arrange high energy intensity and high beam quality laser. The tilt-tip wavefront aberrations and phase differences of each beamlet's have significant impacts on coherent beam combining. A coherent beam combining system of two fiber lasers was set up. In the experiment, adaptive fiber optics collimator and phase modulator were introduced to realize tilt-tip and phase control. The metric function came from the laser spot data acquired by high-speed camera, the control method was SPGD algorithm and the whole control was carried out by a computer. The contrast of combined spot is 0.03 and power in bucket is 8.03 before tilt-tip and phase-locking control, after tilt-tip and phase-locking control the contrast is 0.59 and power in bucket is 32.89, which means the control makes obvious improvement in coherent beam combining.