We　demonstrate　a　high　repetition　rate,　high　average　power　narrow-linewidth　fiber　amplifier　at　1.55　mu　m　eye-safe　waveband　by　using　a　very-large-mode-area　active　fiber　doping　Er　and　Yb,　having　a　60-mu　m-diameter　core　and　a　600-mu　m-diameter　inner　cladding.　A　maximum　average　power　reaches　16　W　at　a　10　kHz　repetition　rate　for　600　ns　pulses　in　the　stimulated　Brillouin　scattering　(SBS)　free　operation,　which　calculates　to　a　1.6　mJ　pulse　energy　and　2.7　kW　peak　power.　In　addition,　the　peak　power　rises　to　4.9　kW　with　148　ns　pulses　at　the　onset　of　SBS.　The　signal　peak　is　located　at　1,551.15　nm　with　a　36　dB　signal-to-noise　ratio　(SNR).　In　order　to　eliminate　the　pulse　steepening,　the　pulse　shaping　technology　using　a　triangular-like　wave　with　a　slower　rising　edge　is　applied　on　the　input　pulses.　The　half-width　of　the　frequency-intensity　spectrum　from　high-average-power　fiber　amplifier　is　about　1.02　MHz,　approaching　the　Fourier　transform　limit.