A multipurpose watermarking scheme for digital image is proposed.After contourlet transform,the subband coefficients are extracted.Then the lower order Krawtchouk moments of the low frequency subbands coefficients are computed,and the watermark is composed of the mean of several functions of the moments.An embedded domain from other subbands is chosen,and the semi-fragile watermark is embedded in it.Quantitative evaluation of invisibleness,ability of resisting the attack and location ability of resisting the falsification of the watermark was made.The results demonstrate the effectiveness of our algorithm in terms of robustness and semi-fragility.