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Considering a variety of noise problems in the downhole communication, denoising method based on Harr ascension wavelet transform is applied to process the downward command signal recognition. On the basis of analyzing of the transmission noise characteristics of drilling fluid flow signal, Haar wavelet lifting scheme, basic principle and implementation steps of signal de-noising were given. Signal denoising was achieved in the use of multi-scale Haar ascension wavelet transform in order to deal with the noises in the three down and three liters signal received on the underground. underground experiment results have proved the validity and feasibility of the method. Contrast experimental results show that the method can not only effectively filter out the noise , but can also maintain the position of pulses edge and pulse width without any distortion , to ensure the effective recognition of the downward signal.