Abstract: It has been observed that vibration energy of disordered reinforced cylindrical shells will be confined to the source in thepass bands.Disordered stiffeners are one of the measures to control the vibration of cylindrical shells.An investigation on localization of a disordered reinforced cylindrical shell will be presented.The vibration of the reinforced cylindrical shell is analogized tothat of coupled oscillator chain system.The localization factors of the reinforced cylindrical shell are predicted using formula derivedfor a coupled oscillator chain system.Vibration parameters of equivalent oscillator chains can be acquired by the disperse curves,which can be identified by wave number analysis based on fnite element analysis.Disordering parameter of the reinforced cylindrical shell can be acquired using the theory on flexural wave in cylindrical shells and theory of statistics.On the basis of the disorderedlocalization factor of stiffened cylindrical shell with unequal spacing,the regularity of the disordered localization factor is studied.Numerical results on some disordered reinforced cylindrical shells are presented,and are used to verify both the feasibility of vibra-tion control by disordered stiffeners and the method on predicting the localization factors in the paper.