The Vander Lugt correlation detection of holographic watermark was simulated by MATLAB software. The original watermark information was obtained from the carrier image by correlation detection. The correlation peak was also obtained and appeared in the position of the original watermark image and the conjugated image without effect by the contrast gradient of the extraction image. The optical correlation detection was set up and used to detect the original watermark information. The correlation peak was obtained from the carrier images distorted by noise added, JPEG compression, part occluded, and low pass filter. The results showed that the correlation peak is bigger than 3; holographic watermark can extract correlation peak of original watermarked image and can be used in copyright protection. It was proved that holographic watermark has strong resistance to low pass filter, noise, and cutting; it has good robustness.