An all-fiber high peak power laser based on master oscillator power amplifier structure is reported.The seed source is a directly pulse driven fiber Bragg grating laser diode at 1064 nm.The seed laser with peak power of 1000 mW is amplified by two stages Yb3+ doped double cladding fibers whose core diameters are 10 μm and 30 μm.The output pulse laser with average power of 63.2 W,pulse width of 14.3 ns,spectrum width(FWHM) of 4.552 nm and beam quality factor M2 of 1.09 is obtained at repetition rate of 100 kHz.The prototype of fiber lasers is developed based on this experiment.