The concep tion of attainment of airborne soft killing high power laser source through fiber combination is put forward. The principle of double cladding fiber laser is analyzed, simp ly illustrated the principle and drawbacks of noncoherent beam combination, the coherent beam combination method ofmultiple optical power amplifier and its advantages are discussed in detail. The analysis has proved that fiber laser through coherent beam combination must be necessary for the future airborne soft killing high power laser source.