Vibration is classified to free vibration, forced vibration, parametric vibration and self-vibration by the type of stimulation. Knocking method and frequency sweep method are mostly applied to measure natural frequencies, which are based on free vibration and forced vibration. This article rises a method based on self-exited vibration to measure natural vibration frequencies and vibration modes of a cylindrical shell. And the self-excited vibration is induced by electrical signal feedback sitimulation, rather than the widely studied friction-induced self-excited vibration or wind-induced self-excited vibration of a wire. This article names it electronical feedback self-extied vibration method. A stainless steel tube is measured by this method and the other two methods for contrastions, and also the ANSYS Simulation, which prove the feasibility of electronical feedback self-vibration method. Conclusions are made by the study that mode of vibration and frequency of the vibration is decided by the position of the sensor. The method based on self-exited vibration requires simper measurement devices and has higher measurement efficiency contrasting with knocking methed and frequency sweep method.