To address the problem of copyright protection for electronic document content and the poor robustness of watermarking algorithm based on text information, a text information hiding algorithm based on dot-matrix character code is proposed. The hiding information is firstly coded by dot-matrix, and the character has the image characteristic property. Then the coded information is encrypted by a two-value chaotic sequence generated by Logistic system. To hide the information, a slight modification of color is made based on HVS and the encrypted information. Experiments have shown that the algorithm has a better watermarking robustness and better practicability for editor attacking of text concent.