Abstract: A new technology method of high speed dynamic balance to balance a slender flexible rotor is presented by using auxiliary tool of balance-balance collars in this paper.A set of precise balance collars are designed and processed according to design criteria and their strength calibration is completed by using finite element method.The experiments of checking and verifying balance collars are accomplished through two simulating shafts.The results of experiments show that the balance behavior of the collars is good and they have little influence on critical speed and vibration characteristics of each simulating shaft.Based on this,high speed dynamic balance of power turbine rotor of turbine shaft engine is satisfactorily conducted by using these balance collars and the effect is very ideal.