Ａ blind separation method was presented to separate vibration sig nals by using double decorrelation. Generally, the mixed signals should be white n at first when using the blind separation method. Firstly, the traditional whit ening method was analyzed and its essence of spatial decorrelation was pointed o ut. Then, the double decorrelation method was obtained with the decorrelation of whitening signals at certain nonzero delay. The separability of the method was analyzed and the process of the algorithm was presented. The feasibility of the method was testified by the separation experiment of the mixed vibration signals , mixed sub-gaussian and super gaussian signals.