Select the color space of the YIQ domain to combine the conjugate symm etric extended Fourier digital holography technology with the Contourlet-SVD domain.A color i mage holographic watermarking algorithm based on YIQ and Contourlet-SVD domain.Beca use the watermark is embedded in any component of the RGB image,it has a large visual i mpact.Choose a color space for converting RGB images to YIQ domains.A 2-layer Contourlet tr ansform is conducted for the luminance component Y.Select low-frequency coefficients in t he obtained detail subbands to perform SVD singular value decomposition.Conjugate symmetric ally expanded fourier digital holography is conducted on the watermarked images to ge nerate the watermarked images.The experimental results show that the algorithm ensures a s trong resistance to the watermark information on the basis that enough watermark information can be embedded. The algorithm is robust to Gaussian noise and JPEG compression attacks,and the NC values are all above 0.91.