Streaming media is a format which plays continuously and immediately in the network such as audio, video or multimedia ifle. This paper describes the conversion between system interface and line interface based on FPGA. The line interface is output by ASSP chip, and system interface is connected with service processing unit. FPGA completes packet caching, packet classiifcation, priority scheduling and bus conversion in the data stream, and generates the corresponding lfow control signals according to the buffer state. It provides useful help for the design of the engineering design packet-switched streaming media technology projects.%流媒体就是指采用流式传输技术在网络上连续实时播放的媒体格式，如音频、视频或多媒体文件。文章基于FPGA实现线路和系统接口的转换，线路接口由适配以太网ASSP芯片输出，系统接口与业务处理单元相连。FPGA在数据流上完成包缓存、包分类、优先级调度以及总线转换，并根据缓存状态生成相应流控信号进行流量平滑。该实现方法旨在为使用实现流媒体技术的分组交换工程设计提供有益的帮助。
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