In order to solve the problem that the technology of digital hol ographic watermarking can not resist the attack of image processing,the low-noise holographic watermark image which is encrypted b y the conjugate symmetry extension,and the watermark is by combining discrete cosine t ransform (DCT) in freque ncy domain with the Laplacian Pyramid transform in the spatial domain.Firs tly,handle the watermark image by Fourier conjugate symmetry extension in order to generate the low-noise double random encryption holographic watermark.Then ,decompose the host image by Laplacian pyramid,and extract the first layer resid ua l image of Laplacian pyramid.Next,embed the watermark which is encrypted into the high frequency domain of host image by DCT transform.Finally,restructur e the first layer Laplacian residual image that is embedded with the waterma rk image and other residual images to get the image containing watermark.The exp erimental results show that not only the PSNR value of t he watermark image can reach 35.7dB,but also the human′s eye can clearly disti nguish the watermark content.It can satisfy the imperceptibility very well,at the same time,can resist common attacks about image processing,and ensure the robustness and security,so it can be used in the practical production very well .