Digital　watermarking　is　an　effective　method　of　resolving　copyright　protection　and　has　become　a　rapid-developing　field　of　research　in　multimedia　information　security.　A　novel　gray-level　watermarks　algorithm　based　on　multiwavelet　transforms　is　presented　in　this　paper.　Multiwavelet　transforms　can　match　the　HVS　model　better　than　scalar　wavelet　transforms,　thus　it　can　well　balance　the　contradiction　between　transparency　and　robustness　of　the　digital　watermark.