UltrasonicvibrationgrindingforC/Ccompositesisintroduced.Superiorityofthistechniqueis demonstratedincomparisonwithtraditionalgrinding.Orthogonalexperimentwasusedtoanalyzethequality ofthecompositesurfaceandtherelationsbetweenthefactorsofultrasonicvibrationgrinding.Thusthemain factorsaffectingthevibrationgrindingarefoundout.