The finite element method was adopted to establish the dynamics model of blade and blades-disk as well as blades-disk-shaft. Based on the analysis of tuned/mistuned structure and the dynamic characteristics of model in different levels

the graphs of different modes and frequency distribution were presented. It was found that the characteristics of the blades considering disk and shaft rotor had a very big difference. Some severe separate and coupled effects mode appeared in some models. In addition

as the mistune may cause the blades-disk and blades-disk-shaft modal coupling in different vibration of blade types

the vibration frequency separation and concentration appeared

even leading to the loss of the system modal and localized vibration. The mistuned structure led to more continuous modal frequency. It thus brings some difficulties for design of the the blade rotor system.