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For hydroelectric generator unit conventional vibration fault diagnosis technology prone to inconsistent results, a information fusion method is proposed based on improved evidence theory. Through the introduction of the credibility factor correct the original evidence, and then by the combination rule of evidence theory carry out information fusion. Case examples show that the method can be the high conflict in the original evidence still gets a better match to determine conclusions, and avoid the existence of divergent phenomenon in several representative improved methods in synthetic consistent evidence, with higher fault tolerance and robustness. Aims to explore the mechanism of evolution of hydropower unit failure, fitting complex nonlinear relationship between fault key parameters and fault types, in order for predict the impending failure of the unit in advance.