The wavelet transform is a current mathematics rapid development of new fields,the paper wavelet transform a simple exposition,its brief the background and the basic concepts of wavelet transform,with the wavelet transform in the field of application of the increasingly widespread,In this paper,its application in various fields were reviewed. The wavelet transform is a current mathematics rapid development of new fields,the paper wavelet transform a simple exposition,its brief the background and the basic concepts of wavelet transform,with the wavelet transform in the field of application of the increasingly widespread,In this paper,its application in various fields were reviewed.