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Under the complex condition of nuclear power plant,all kinds of influence factors may cause distortion of on-line monitoring data.It is essential that on-line monitoring data should be de-noised in order to ensure the accuracy of diagnosis.Based on the research of wavelet analysis and threshold de-noising,a new threshold denoising method based on Mallat transform is proposed.This method adopts factor weighing method for threshold quantization.Through the specific case of nuclear power plant,it is verified that the algorithm is of validity and superiority.