All fiber ring cavity Er 3+/Yb 3+ co-doped double cladding fiber(EYDF) laser was achieved with 15 m long EYDF pumped by LD of 975 nm output wavelength through a taped fiber bundle(TFB).Six couplers with different couple ratio have been employed as the output coupler of the ring laser to optimize the experimental result.The best result is achieved when the output couple ratio is 99%;the laser output power is 1.07 W with the laser wavelength of 1 565.8 nm,the slope efficiency and optic to optic conversion efficiency is 40% and 30.5%,respectively.