A novel optical fiber oil leakage sensor based on Brillouin optical time-domain analysis is reported,which can be mainly used for real-time and small-scale monitoring.of long-distance oil pipeline,oil depots and other places. Though simulating pipeline transportation state,sensing fiber is em bedded in oil sensitive material laying along the pipeline,and the leakage location can be found by real-time mo nitoring Brillouin frequency shift. Experimental results show that the technology is feasible,small-scale oil leaka ge can accurately be located in 10min,and 0.1m positional accuracy is realized on 1.7km sensing optical fibe r by BOTDA.