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The proposed scheme of this paper is embedding watermark into intra frame (I-frame). The most challenge of watermark that embedded into intra frame is the selection of intra prediction might be changed. In the research, different AC coefficient gets different effect when the selection of intra prediction was changed in another compression course. Therefore, it's necessary that finding what AC coefficients can be embedded watermark to avoid the quality of video might be too much lower and the watermark might be lost in another compression procedure. The proposed scheme provides a method that can endure the change of intra prediction. This scheme would against the losing of compression has be proved in accordance with the experiment results.