In video coding standards such as H.263 and MPEG-1,motion search is based on half pixel,so it is necessary to construct half pixel pictures.This paper investigates fast construction of half pixel pictures adopting Intel MMX technology in software video coding.The computation cost is reduced by 44.4% in this way.The ratio of that to the total cost in the typical encoding system is reduced from 12.3% to 6.8%.%在H.263、MPEG-1等视频编码标准中，运动搜索精确到半像素，所以需要构造半像素图像．研究了在软件编码时利用Interl MMX技术快速构造半像素图像，结果使计算开销减少44.4%，在典型编码系统中占总计算开销的比例由12.3%降为6.8%
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