Phase controlling is one of the key techniques in fiber laser coherent combination.“Hill Climbing” and heterodyne phase control methods are investigated in fiber laser coherent combination.“Hill climbing” which can adjust the controlling output voltage to reduce the error of optical phase dynamically.The other heterodyne method can detect phase error directly and can correct the error timely.The optical phases are locked and a 0.91 Strehl Ratio is achieved in the Coherently phased 7element fiber array coherent combination experiment.Also,the phase of 10 W fiber amplifier is locked,and the control precision is better than λ/10.The results lay a foundation to achieve coherent beam combination of fiber laser array with higher power and more elements.