A robust blind digital watermarking scheme based on non-subsampled contourlet transform (NSCT) and human visual system (HVS) was proposed. In this paper,we establish a model of the human visual system in NSCT domain,using visual masking effect of HVS to adaptive embed watermark sequences. The experimental results show that the digital watermark not only the transparency can be guaranteed,but also has good robustness to noise addition,JPEG compression,cropping,filtering and image twisting etc. Furthermore,the watermark can be detected without original image. This is a perspective blind watermarking scheme.