A new－style high－performance ring wavelength－tunable fiber Bragg grating laser is studied, which used 980nm LD as pump source and 10. 8m new－style gain flatting erbium－doped fiber as gain medium. Precisely locked to the ITU - Twavelength grid with the stability of 0. 01nm using tunable fiberBragg grating is demonstrated. The tuning range of 41nm (1528nm～1569nm) , linewidth in 3 dB < 0. 08nm and in 25dB < 0. 2nm, and edge－mode supp ression ratio > 60dB have been achieved. The maximum output power is 46. 94 mW, and the stability of power is better than ±0. 02dB. The threshold and slope efficiency of laser are 7. 3 mW and 39. 75%. The output power of fiber ring laser influenced by difference split ratio of output coup lers or different length of Er－doped fiber are discussed.