A novel reflection L-band erbium-doped fiber (EDF) amplifier is constructed based on fiber loop mirror (FLM), which reflects the backward ASE to the EDF as a secondary pumping source. And the signal can also be reflected into the EDF by the FLM so that it is amplified secondly. In the wavelength region from 1570 nm to 1605 nm, the small signal gain is 29.14 dB increasing by 5.33 dB compared to the forward end-pumped erbium-doped fiber amplifier (EDFA) when the pump power is 115 mW. The saturated output power is 7.63 and 7.6 dBm for 1580 nm and 1600 nm signal increasing 2.98 and 3 dB compared to the forward end-pumped EDFA, respectively.