Surface smoothing process can lead to a great change on surface shape. A new way to smoothing surface is presented. After surface’s deformation, its high frequency components are deleted and low frequency components are remained according to principle of wavelet’s decomposition. In B-Spline wavelet，the details which are lost during the decomposition are captured to smooth the surface, the entire shape of the deformed surface hardly changed，and some continuity is satisfied. Wavelet decomposition and local deformation of surface edge or sharp point can get effective smoothing processing. Wavelet decomposition has the advantages of fast calculation，stability，and especially suitable for smoothing surface defined by the control vertices.