Multi-wavelength seed laser can mitigate stimulated Brillouin scattering(SBS)and improve the output power of the narrow-linewidth fiber amplifier.In this present study,coherent combining of two fiber amplifiers seeded by a multi-wavelength laser is proposed and demonstrated using stochastic parallel gradient descent(SPGD)algorithm.The long-exposure visibility of the far field interference patte is increased from 0.15 to 0.97 when the system evolves from open-loop to closed-loop.The feasibility of coherent combining of fiber amplifiers seeded by multi-wavelength seed laser is validated.