Abstract: Infrasonic wave-based leakage detection and location technology for oil & gas pipelines is a way, which detects the infrasonic wave signal generated by the jetting fluid acted on pipe walls to inspect and locate the leakage point. The infrasonic wave frequency at 0.4 Hz, 3.8 Hz and 7.2 Hz are taken as test characteristic because the frequency domain characteristic of leakage signal is within 10 Hz. The abnormal data and GPS time will be sent to a center monitor after the mutation of 2 power spectrum of characteristic frequencies and changed energy order ratios themselves are detected, the center monitor calculates the start-time and data length of captured anomalous signals from the other end stations, then calls the data from the end stations, and makes further leakage diagnoses according to the two ends data and neural network model. Meanwhile, the leakage points can be located according to the GPS time lag of anomalous signals from the two stations, the propagation velocity of infrasonic wave and the monitored length of pipeline.Key words: pipeline, infrasonic wave, leakage detection, location