With　the　development　of　fiber　technology,　fiber　laser　is　getting　more　and　more　important　in　industry　for　its　small　volume,　high　efficiency,　high　quality,　and　good　stability.　Recently,　pulsed　fiber　laser,　which　has　high　peak　power,　high　repetition　and　high　pulse　energy,　is　widely　used　in　optical　fiber　communication,　medical,　especially　for　middle　and　low　power　processing.　A　steady　and　self-starting　mode-locked　pulse　ring　cavity　fiber　laser　as　seed　source　was　obtained.　The　70　mW　signal　got　25.2　dB　gaining,　using　two　steps　cladding-pump　in　double　cladding　fiber　and　master-oscillator　power　amplifier　(MOPA)　structure.　A　mode-locked　pulse　laser　was　obtained,　which　was　23.07　W　in　average　power,　1064　nm　wavelength,　41.3　MHz　in　repetition　frequency,　50　ps　in　impulse　duration,　0.56　pJ　in　single　pulse　power,　11.2　kW　in　peak　power　and　42.4%　in　conversion　efficiency,　realizing　all-fiber　mode-locked　pulse　fiber　amplifier.