In this paper, the dynamic properties of the main sounder （the sounding muscle （SMc） and the sounding membrane （SM）） and the generating mechanism of amplitude-modulation pulse train （AMPT） are given. The acting process of SMc is a quasi-simple harmonic contraction vibration. The amplitudes of soundless and sounding contracting motion are about 17.2 /μm and 29.4/μm, respectively, and the efficiency of dynamic sounding is about 17％, The unsounded motion of SM is a quasi-simple harmonic vibration, and the amplitude is about 7.81/μm. The sounding motion of SM is a complex vibration, and the amplitude is about 12.66 μm. In each syllable of the song, AMPT1,2,3 are separately produced by driving vibrations （V1,2,3）) of three long ribs in the upper half of SM, and the peaks of V1,2,3 lead the first pulse of high amplitude in AMPT1,2,3 by 0.156 ms, respectively. The membrane structure in the lower half of SM is mainly to transmit contracting movement of SMc.
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