Abstract: This paper proposes a Voice Activity Detection（VAD） method based on wavelet transform C₀ complexity（WC₀），which improves the traditional C₀ complexity，using fuzzy C means clustering algorithm and Bayesian information criterion algorithm to estimate the thresholds of the WC₀ characteristic，and using dual threshold method for VAD.Experiments on the TIMIT continuous speech database show that at low SNR environments，WC₀ method is superior to C₀ method.Especially in the vehicle noise and vehicle interior noise environments，WC₀ method shows better detection performance.