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The state-of-the-art machining strategy has been more organized and systematic rather than dependent on trial and error approach.Identification of system dynamics is an important input to solution of optimal machining configuration.In this paper, laser vibrometer is used to measure the amplitude and frequency of an ultrasonic vibration milling system and the runout frequency of a micro tool attached to a high speed air spindle system.The amplitude and frequency of the end effector of the ultrasonic vibration system can affect machined surface quality.So cutting condition needs to be adjusted considering the dynamic characteristics of the ultrasonic vibration assistant milling system.Illustrated and analyzed are the measurement results of the vibration characteristics of the designed system as well as surface roughness comparisons from machining results.