According to multimedia advertising system has a problem of single function, advertising less for traditional, so designed and developed mobile multimedia advertising system which based on embedded technology. This system used ARM920T embedded processor S3C2440 as the core and embedded Linux for real-time operating system. It can display Multimedia advertising broadcast, the text ads displayed real-time. It’s a function of showing and updating to be realized by the GPRS communication module receiving the weather forecast information to realize the weather forecast. The result shows that this system support several kind of video format，can automatically search and display pointed type of video and txt advertising, displaying and updating the weather information。The system can be applied to bus, supermarket, commercial building, hotel and any other public place.