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This article studies the compressed domain motion compensation and spatial definition downscaling technology in video transcoding, solves two problems of existing algorithm: cant handle negative motion vectors and the block order it adopts disagree with MPEG-2 standard,and gives out detailed algorithms and some necessary analysis from the realization point of view. The result of the experiment shows that MPEG-2 TM5 decoder reconstructed based on the algorithms and analysis this article gives out can realize compressed domain motion compensation and spatial definition downscaling correctly.