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Concerned with the complexity of prognostic and health management,this paper proposed an algorithm of fusing data based on neural network .The proposed method has a high accuracy,which contains plentiful information for fault diagnosis. Two theory methods that combined the method of fault prediction based on data and the method of Physics-of-Failure models ,which take full advantage of each method. On the one hand,the method of fault prediction based on data can find out whether the fault is existed. On the other hand,the method of Physics-of- Failure models can provide us the root of fault. The efficiency and accuracy of fault prediction were both quite higher based on the approach of fusion prognostics,which enrich the theory system of prognostic and health management and strengthen the practical value.