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The method of auditory system design based on time difference is proposed. According to the special character of sound signal and basic need of collection technology, it had been explored to the microphone choice and the signal pretreatment. The programmable counter array was adopted to capture the time difference. In this paper, sound signal amplifier, waveform shaping, calculation of the sound source and software implementation was designed. Experiments showed that the design can make the robot rapidly and accurately reach the target sound source location.