An　all-fiber　polarization　maintaining　high-power　laser　system　operating　at　1.7　mu　m　based　on　the　Raman-induced　soliton　self-frequency　shifting　effect　is　demonstrated.　The　entirely　fiberized　system　is　built　by　erbium-doped　oscillator　and　two-stage　amplifiers　with　polarization　maintaining　commercial　silica　fibers　and　devices,　which　can　provide　robust　and　stable　soliton　generation.　High-power　soliton　laser　with　the　average　power　of　0.28　W,　the　repetition　rate　of　42.7　MHz,　and　pulse　duration　of　515　fs　is　generated　directly　from　the　main　amplifier.　Our　experiment　provides　a　feasible　method　for　high-power　all-fiber　polarization　maintaining　femtosecond　laser　generation　working　at　1.7　mu　m.