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This paper presents the major techniques of AVS video decoder and the design methodology using the new generation system design language - SystemC. We model the AVS video decoder with SystemC on three levels. The algorithm modeling realizes the division of each module; the system schedule design adds timing sequence information, schedule information and interface design to the system; the parallel modeling between modules improves the speed of system. Through the modeling of these three levels, we have realized AVS video decoder with SystemC, which can decode AVS compressed dataflow correctly.