Most watermarking schemes for text documents are usually implemented by embedding a mark in a host document itself for intended purposes. The existing techniques for text watermarking are confronted with the problems of perceptible quality degradation and the inherent conflict between imperceptibility and robustness, which introduced by the watermark embedding. In this paper, we propose a novel text zero-watermarking scheme for content authentication. This method can solve the problems mentioned above through embedding the authentication information in the constructed binary pattern of Chinese Word document, not in host document itself. In this scheme, the hashing value of the text document’s content calculated by MD5 algorithm and the structure knowledge of Chinese characters are exploited for constructing the binary pattern, and the chaotic encrypting algorithm is used to enhance the security of the watermarking scheme. When any modification of the text document's content is made, the extracted result will be completely different to the original authentication information. The experimental results indicate that the proposed zero-watermarking scheme is efficient and secure.