The experimental demonstration of the three characteristics of sound (pitch, loudness, timbre) （section 2 "Properties of Sound”of "Phenomena of Sound" in Grade 8 Physics Volume 1, People's Education Press)has certain limitations.In order to show the three characteristics of sound visibly、audibly and quantifiably, to help students better understand the three elements of sound,the author use sound signal generator(mobile phone APP software)to output the sound signal of quantized frequency,use a virtual oscilloscope + computer (built-in oscilloscope software) + acoustic microphone to combine a portable oscilloscope (easy to capture waveform images) to detect sound waveform，also self-made the foam particle type Quint tube to displays the visualized form of sound vibration.The experimental phenomenon is obvious and original，showing the three characteristics of sound visibly、audibly and quantifiably,it helps students grasp the concepts of physics knowledge more easily.