Abstract: A new wavelet multi-resolution watermarking algorithm for images based on human visual model is presented. This scheme makes good use of the advantage of wavelet multi-resolution and the feature of human visual system, thus keeping the watermarks invisible and robust. Also, this algorithm need not original image and is only relevant to some detail sub-images during detection. The experimental results have shown that the digital watermarks, which are inserted in host image by the proposed algorithm, is robust for median filtering, salt-and-pepper noise and JPEG compression.