Aiming at the problem that the frequen cy domain watermarking technology can′t resist rotation attacks effectively,th is paper puts forward the digital watermarking algorithm against rotation attack based on structural similarity (SSIM).Firstly,the watermark interferes with the reference light to generate discrete cosine transform (DCT) holographic image,a nd then it is embedded into the host image in B c hannel using the frequency domain DCT.Finally,in the watermark extraction,image tilt angle corrected the inverse DCT transform waterma rking detection by SSIM.The experimental results show that for the embedding of watermark image with strength of a= 0.1,the PSNR reaches 43,it can resist rotation attacks of 1~360° effectively,and the highest point can realize o f rotation correction.The embedded watermark has strong invisibility extraction and high embedding capacity.So,by t his algorithm the watermark is extracted from the host image accurately,from rotating,filtering,noise,cutting and the geometry deformation attack.The results of the study can be used in the proof of the copyright proprietors.