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Robust streaming of video over 802.11 wireless LANs (WLANs) poses many challenges, including coping with transmission packet loss and packet data error. In order to reach that, it is very critical for network to identify each video frame and to know the decoding priorities for each video frame. In this paper, a new cross-layer design technique, deep packet inspection (DPI) technique, is proposed to deal with this question, which penetrates into linker layer, network layer, transport layer, and closely exams the video stream and marks the video sequence information, video GOP information, video frame type and many other parameters. The simulation test also proved the availability of this technique.