Faced to the raw signal acquired in the CMOS pixels,this paper puts forward a new algorithm which could be applied to degrading Gauss noise emerged in the imaging process.This wavelet threshold denoising algorithm is based on the method presented by Donoho.In this new algorithm the input SNR is parameterized.The simulating results with Matlab are presented.The experimental results show that the improvement for the SNR is 2.2 dB and 0.2 dB compared with the soft thresholding method and the hard thresholding method respectively when input signal is Blocks and input SNR is 3 dB 13 dB.