An all-fiber pulsed laser which can output different characteristic pulse laser by adjusting an acousto-optic modulator (AOM) is introduced. The pulses full width at half maximum (FWHM) vary from 3 ns to 900 ns at the repeat-frequency modulated to 10 kHz. Average output power 1.24 W is obtained at 10 kHz, and FWHM is 65 ns, single-pulse power is 0.13 mJ and peak power is 2 kW. At 100 Hz peak-power can reach 10 kW with output power 84 mW, single pulse power 0.84 mJ and FWHM 86 ns. The all-fiber laser has simple configuration, its parameter can be adjusted by AOM easily, which can greatly extend the applications in power amplification, pulse-compression and high-repeat frequency as laser seeds.