This paper analyzes the structure of MPEG-2 system transport layer, puts forward a realization project about MPEG-2 demultiplex, introduces the main functions of AbiA-DMX and the microcode, and finally carries out the hardware and software designs of MPEG-2. 分析了MPEG-2系统传输层的结构,提出解复用的一个实现方案,介绍了解复用芯片的主要功能及其微码的主要作用,对解复用进行硬件设计和软件编程。