Carbody abnormal vibration analysis of a high-speed EMUs was researched, mainly containing the wheel tread measurements,carbody vibration on-line test, turn around running and vibration compared before and after repairing profile. The results showed that the change of wheel/rail wear matching in the partial line induced equivalent conicity increasing and affected vehicle dynamic performance. The performance of carbody abnormal vibration was the resonance response around 9.5 Hz. Turn running could not solve the problem of carbody abnormal vibration, but repairing profile was able to effectively improve carbody abnormal vibration. The root reason of carbody appearing abnormal vibration was mismatch between wheel and rail, which led to excitation passing up and results in carbody local resonance. So repairing profile and repairing track both could improve the matching relation between wheel and rail, and solve carbody abnormal vibration problems.