A random distributed feedback erbium-doped fiber (EDF) laser based on weak reflectivity fiber Bragg grating (FBG) array has been proposed and experimentally demonstrated.It contains a 2-m-long high concentr ation erbium-doped fiber pumped with a 1480nm laser diode to provide gain and amplification,and an array of weak reflectivity FBGs to achieve random distributed feedback.The laser possesses several important advantages,including low pump threshold,narrow line width,high slope efficiency and stable laser output.In the experiment,an FBG with high reflectivity of 90% is connected to one end of t he laser cavity to reflect a narrow band of light,and an FBG array with 20weak reflectivity FBGs with the same Bragg wavelength and indi vi dual and total reflectivities of 5‰ and 9% respectively is connected to the other end of the laser cavity to provide random distributed feedback.By using a 1480nm pump laser with maximum output power of 400mW,we successfully achieve a stable and narrow line width laser output whose threshold power is 3mW,slope efficiency is 24%,and the peak wavelength is 1549.44nm.The g ood laser output stability is tested by multiple repeating measurements of the laser output spectrum under a fixed pump power at a cert ain time interval.