An improved algorithm based on a lifting scheme wavelet transform is proposed to protect the copyright of a cultural relic image during Web sharing.The YCbCr color space is used to ensure the lightness and color sensitivity in a visual system.Then,the Daubechies9/7 biorthogonal wavelet is introduced to transform the image into a frequency domain and to hide watermark information to improve the anti-attacked capability.Meanwhile,a lifting scheme is used to enhance the stability of the algorithm.Finally,in order to increase algorithm's robustness and security,a new embedding method is presented to embed the intermediate and high frequency watermark information into image's high frequency coefficients,and the embedded position is switched dynamically in depending on the neighborhood coefficients.Experimental results indicate that the cultural relic image show a better visual quality after embedding watermark,and the Peak Signal Noise Ratio(PSNR) of the watermarked image is 51.602 4,which is better than that of other algorithms.Compared with LSB and DCT algorithms,the proposed algorithm has good performance in the anti-attack and lossy compression and is suitable for the fields which request high security such as digital museums.