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Ball bearing is one of the most easily damaged parts of rotating machinery. Envelope demodulation technique is one of the most effective methods for ball bearing early fault diagnosis. However, in the process of using the resonance demodulation technique, it is difficult to determine the resonant band which contains side band of bearing components failure characteristics. In order to resolve the issue, this paper proposes a method of automatic selection of band-pass filter enter frequency, which is based on envelope spectral kurtosis. Experimental result shows that the proposed method can be used to indicate the best band to demodulate for envelope analysis and achieves adaptive fault diagnosis of ball bearing.