Realize a H.264 decoder system based on DaVinci DM6446 platform for a high efficient video compression and a high reliable video transmission. The system hardware and software framework is discussed in detail integrating and applying the technique of H.264 video coding and recoding, video transmission, network communication and embedded system design. The result shows that the system can receive, decode and display multiple resolution and variable bit rate of H.264 video data real-time, and is flexible to configuring, convenient to use and anti-channel jittered.