Abstract: A supported MPEG2 protocol, applied to ARM9 core, high-speed and low-power two-dimensional DCT coprocessor is introduced.With the optimization of the structure of two-dimensional DCT co-processor, the speed of processing 8×8 block is largely improved.At the same time, A modified one-dimensional DCT CORDIC algorithm is applied, using a special shifter in place of traditional multiplier.The simulation result showed that, Based on the precision and the transition frequency requirement, for this one-dimensional DCT implemented by hardware, the speed is 30% faster than paper2 while the area has decreased by 50%.This Coprocessor can be largely used in the Code/Decode module of multimedia products.