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This paper explains and demonstrates how to apply the digital technique of sound wave contrast-into foreign oral teaching, using the software of media player and cool edit 2 to acquire the experimenters speech sound waves. The key is to offer the obvious sound wave contrast among the wave of the native speaker, the original and unmodified wave of the oral experimenter and the new wave of the oral experimenter after modifications and teachers instructions, which makes the oral autonomic learning more possible and more scientific. From long wave or short wave, wave trough or wave crest, smooth wave or sharp wave, it can be easily identified the deviations and the weaknesses of the experimenter from the standard during the daily practices so it is necessary to make corrections efficiently. Additionally, experimenter also can observe the improvements frequently, which means this experiment more instructive.