Abstract: Objective To study the characteristic of joint sounds from temporomandibular joint(TMJ)without symptom during mandible movement.Methods Joint sounds of 42 asymptomatie TMJ were recorded and analyzed with K6-I system during mandible movement,the waveform,frequency range,peak frequency and amplitude of joint sounds electrosonogram were studied. Results Joint sounds were recorded in 25 ioints ofthe 42 joints,4 kinds ofjoint sounds were found according to the waveform,frequency range,peak frequency and amplitude of the electrosonography. Conclusions Joint sounds can be recorded in asymptomatic TMJ during mandible movement,4 kinds of joints sounds were found according to the electrosonographic characteristics.