A wavelength-selection discretely tunable erbium-doped fiber laser in L-band is demonstrated by using a high birefringence fiber loop mirror(Hi-Bi FLM) as a precise multi-wavelength grid filter.With a Hi-Bi FLM and an L-band channel-selection tunable filter,41 wavelengths spacing on 100 GHz are obtained.Moreover,the laser output power variation between different channels is less than 3.1 dB.And optical signal-to-noise ratio(OSNR) is more than 32 dB.