Abstract
"Suikinkutsu" is a sound system to amplify water drop sound in a basin. At first, we studied on water drop sound and its resonance at the space in order to analyze suikinkutsu. Vibration of bubble generates water drop sound. Volume of bubble decides the frequency of water drop sound. Resonance at the space in the basin amplifies the specific frequency defined by the natural frequency of space in the basin. From results of their studies, we clarified the characteristics of suikinkutsu sound.