We demonstrate a passively harmonic mode-locked(PHML)fiber laser operating at the L-band using carbon nan-otubes polyvinyl alcohol(CNTs-PVA)film.Under suitable pump power and an appropriate setting of the polarization controller(PC),the 54th harmonic pulses at the L-band are generated with the side mode suppression ratio(SMSR)better than 44 dB and a repetition frequency of 503.37 MHz.Further increasing the pump power leads to a higher frequency of 550 MHz with compromised stability of 38.5 dB SMSR.To the best of our knowledge,this is the first demonstration on the generation of L-band PHML pulses from an Er-doped fiber laser based on CNTs.