Abstract: An integrity authentication watermarking for H. 264 video compression standard is proposed. Watermark information embedded in the video frame by modulating the component of the residual motion vector. In order to reduce the impact of video quality after watermarking, the selection criteria for the macroblock was restrained. Furthermore, taking into account the movement of the video, the watermark is embedded into the larger absolute value of the residual component. Experimental results show that the algorithm brings very small bit-rate changes and video distortion, and can be subiected to tampering with the video, authentication the integrity of the video content.