An image interpolation scheme was introduced based on edges preserving using discrete dyadic wavelet transform(DDWT).By the exponential decay property of the multiscale edges,the edges of the lost high frequency subband are predicted.And the other coefficients of the high frequency subband are obtained by cubic spline interpolation algorithm.So the high-resolution image may be generated by the wavelet synthesis.Experimental results show that the interpolated images of the algorithm are better than conventional algorithms such as bilinear and bicubic interpolation.For images that own less texture like Lena,the PSNR value increased about 2 dB.And the interpolated image quality of others may also have some increasing.The high-resolution images are more in of accord with human visual system characteristic.