Abstract: The paper proposes a method that embeds the result of watermark-decomposing by rows or columns operates in spatial and frequency domain respectively into a digital document.The strategy of watermark-decomposing used in this algorithm ensures the integracy of decomposed watermark image.Experimental results demonstrate that thanks to the combination of spatial and frequency domain，the watermark has greater robustness than those used spatial or frequency domain alone to signal processing techniques and geometric distortions.