In order to improve the robustness of the holographic watermarking alg orithm in discrete wavelet domain,we propose a robust hologram watermarking sch eme based on discrete wavelet transform (DWT) and quaternion discrete Fourier transform (QDFT),which can b e used in hardcopy color image.Firstly,for getting a robustness embed area,we conducted DWT on the three color components of the host color image and got their lo w frequency coefficients to construct a pure quaternion matrix.Then the mid dle frequency region of the real part of QDFT coefficient was replaced by holographic watermark information.By i nverse QDFT and wavelet reconstruction,we finally got the watermarked color image.Experimental results demonstrate that the proposed algorithm achieves good performance in robustness against both common signal operations and print-and-scan attack.Computer-generated hologr aphy technology and low frequency wavelet coefficient domain embedding manner provide a robustness guarantee.The quaternion used in processing color image makes the algorithm have good perfo rmance in invisibility even the low frequency information of the host image is modified,and provides a more covert embedding area combined with transform domain .