Since human organs, such as blood vessels, tracheas and urethras, have similar characteristics to collapsible tubes, a lot of studies on both steady and unsteady flow through the collapsible tubes have been done in biological and physiological fields [1, 2]. Recently, Sakurai et al carried out an experimental analysis concerning the effect of longitudinal tension on collapsible tube flow . However, the real figure of this complex system, including the influence of the tube parameters on self-excited oscillation is still not sufficiently understood. In present report an experiment was performed to investigate the dynamic characteristics of a collapsible tube flow. The effect of initial axial strain of the tube on the self-excited oscillation was studied by changing the initial stretch of a thin-walled silicone rubber tube for various values of supply flow rate.