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Current Information hiding algorithms for webpage have some shortcomings, such as the ability of concealment is poor and the embedded capacity is little. As the tag and its' attributes have multi-express rules, a new information hiding algorithm is proposed in this paper. This Information hiding algorithm sets secret information into a binary sequence, then set 3 bits as a set to be hidden in page tag attributes on random. As showing in the experimental results, this algorithm can significantly increase the embedded capacity, and will not increase the size of cover-webpage, so it has better imperceptibility and higher capacity than the traditional algorithm.