The high resolution range profile is sensitive to noise signal. The key technology of accurate target recognition is how to find a new type of de nosing algorithm of wavelet to get high SNR high resolution range profile. By measuring and analyzing de-no sing algorithm of wavelet modular maximum and denosing algorithm of wavelet threshold, the threshold function was improved and a new type of de nosing algorithm of wavelet threshold was put forward based on the classical algorithm. The experiment evi dences that the new algorithm can improve the SNR of resolution range profile better and restrain noise sensitiveness. By combining the advantage of de nosing algorithm of wavelet soft threshold and hard threshold, the new algorithm has good application value.