In　order　to　avoid　the　thermal　effect　of　fiber-end　in　high　power　fiber　laser,　the　fiber　laser　based　on　the　multi-point　cascaded　was　studied.　First,　the　self-developed　cascaded　couplers　were　introduced.　Then,　the　effect　of　the　couplers　insertion　on　the　fiber　laser　was　analyzed.　Finally,　the　fiber　laser　and　the　master　oscillator　amplifier　with　the　pumping　distributed　structure　were　built.　Experimental　results　indicate　that　the　research　on　the　insertion　loss　of　the　coupler　can　promote　the　development　of　high　power　cascaded　coupler.　In　the　distributed　fiber　laser,　the　output　power　of　1　080　nm　is　770　W　with　the　pump　power　of　1.1　kW,　and　the　optical　to　optical　conversion　efficiency　is　77%.　The　output　power　of　maser　oscillator　power　amplifier　structure　is　635　W　with　the　optical　conversion　efficiency　is　78%.　It　can　satisfy　that　the　distributed　pumping　can　solve　the　heat　concentration　in　fiber　laser,　can　achieve　the　kilowatt　fiber　lasers.　©　2016,　Science　Press.　All　right　reserved.