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In order to detect the leakage of gas pipeline ,the frequency range of acoustic signal generated by gas pipeline leakage is found. Then the relationship between Duffing oscillator’s driving force phase, frequency and phase trajectory is analyzed. Use different driving force phase of Duffing oscillator, and convert angular frequency of acoustic signal to 1 can detect the leakage of gas pipeline. The field test results show that the method has a well detection effect on the leakage of various leakage apertures, and can used to detect the small size leakage of gas pipeline.