An all-fiber configuration linearly-polarized fiber laser reported, with one pair PM fiber Bragg grating for wavelength and polarization selection. The maximum linearly-polarized laser output power is 30.2 W, which respects to the launched pump power of 50 W from a 975 nm diode laser pumper. The optical-to-optical efficiency is 60%, and polarization extinction rate (PER) is better than 22 dB. The output central wavelength as well as the full width at half maximum (FWHM) of spectrum can be precisely adjusted by controling the temperature of the fiber Bragg grating.