Abstract: Awavelet energy accumulation model, which can be used to obtain the accumulation in different decomposition scales, is designed on the basis of multi-scale decomposition properties ofwavelet transform. Furthermore, a wavelet energy detectingmethod forweak signal detection is presented, and the detection of signalswith low signal to noise ratios (SNR) is experimentally simulated. The simulation results show that the detecting method proposed in this paper is fairly effective in detecting low SNR weak signals, and is advantageous over the conventional method which uses accumulating and averagingwithin a pulse.