According to previous experimental study, local vibration that forms natural mode (wave number 2) around reattachment point was observed on elastic tube wall downstream of stenosis. A peak exists in the frequency spectrum, and the peak frequency depends on both character and transmural pressure of the tube. In this paper, these effects on the peak frequency were discussed. Measured peak frequency was agree with natural frequency of ring model that is affected by the influence of hoop tension. Consequentry, it was found that the tube character dependence is attributable to difference of local vibration system of the tube, and transmural pressure affects the peak frequency as the effect of hoop-tension in the wall. Moreover, by the influence of fluid and medium, effective mass of the vibration system is increase, and, the natural freaquency is dropped.