ing at the problems of optical alignment in optical transform watermarking algorithm and the security of optical cryptosystem, an optical watermarking method based on hyper-chaotic mapping and Gyrator transform is proposed. The hyper-chaotic phase mask is constructed by using the Chen 4D hyper-chaotic system, and then the vortex light constructed by the Fresnel zone plate and the radial Hilbert mask is used to illuminate the hyper-chaotic phase plate. Finally, the encrypted watermarking image is embedded into the host gray image by means of Gyrator transform to realize optical information hiding in the Gyrator domain. The Gyrator inverse transform is used to extract the watermark information embedded in the target image. The experimental results show that the algorithm can extract high-quality watermarking information from highly imperceptible target images. The encrypted target image has a high signal-to-noise ratio and strong correlation with the host image. It can effectively resist salt and pepper noise and Gauss noise attacks with intensity coefficients of 0.06 and 0.8 respectively, and has good robustness against attacks with less than 50% occlusion rate and 80 compression factor. The encrypted target image has a similar statistical distribution compared with the original host image, which realizes information hiding well.