A novel color image watermarking algorithm based on contourlet transformation and computer generated hologram was put forward. Firstly, the watermarked host image in RGB mode was converted to YCrCb color space, and contourlet transform was performed on the luminance Y component to get detailed sub band images. The watermarked image was encrypted with Fourier hologram technology. Finally, the encrypted digital watermark was embedded into decomposed detail sub bands of discrete contourlet transform. Simulation results showed that the proposed algorithm has good invisibility and is robust against common geometric transformation and multiple attacks.