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Aiming at low cost and high performance for audio interface requirements used in the electroacoustic testing system, a special audio interface is designed, which is composed of the slave computer embedded system and the host computer software. The audio interface uses high-speed USB2.0 interface to transmit audio data, and carries out D/A and A/D conversion through audio codec to achieve the function of playing and recording. By the test, the total harmonic distortion of sinusoidal signal generated by audio interface is lower than that of professional sound card; the amplitude frequency characteristic of the signal acquisition channel is better than that of the professional sound card; synchronous recording function enables full synchronization of recording and playing.