Many defects,such as poor robustness and low transparency,appear when a watermarked image is introduced into color printing processes.Based on the feature that the sensitivity of human visual sy stem is low to variations of high frequency along yellow-blue axis,a color printing oriented watermarking method ultilizing ICC color space transforming technologyi s presented in this paper. Watermark information is embedded firstly in the yellow-blue color channel base d on CIEL*a*b* color space which is device independent and then a template signal for watermark synchronization is also emb edded in the red-green color channel in order to resist geometric distortion during print-scanning process and to avoid image degradati on because of multiple embedding in yellow-blue color channel.The watermarked images is then screened with AM screening process and p rinted with lithography.To improve the accuracy of watermarking signal detection,de-screening is used before detecting the waterm ark.According to the results,the preserve algorithm preserves watermark ′s transparency well and it is robust to printing p rocess.Meanwhile,it is also robust to conventional image processing and geometric transformation,such as JEPG compressing,image enlargem ent,reduction and rotation.This method can be used synchronously in both digital and hardcopy color images for copyright prote ction.