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H.264/AVC是一种由ITU-T视频编码专家组合ISO/IEC JTC1动态图像专家组联合提出的高度压缩视频编码器标准。然而H.264/AVC编码器较高的运算复杂度提高了多屏共享系统的延迟时间。H.264/AVC 由多种开源的实现，其中X264因简单高效而得到广泛的应用。在此对多频共享系统的关键技术进行实现，分析X264编码器提供的运动估计算法并且提出一种优化的算法。实验表明，新的算法提高了编码的速度、减少了系统延迟时间，同时视频质量几乎没有产生损失。“,”H.264/AVC is a high compression video encoder standard proposed by the ITU-T Video Coding Experts Group (VCEG)and ISO/IEC JTC1 Moving Picture Experts Group(MPEG). However,the higher computational complexity of H.264/AVC encoder increased the delay time of multi-screen sharing system. The motion estimation algorithms provided in X264 are analyzed in this paper. An optimized algorithm is proposed,which can reduce the unnecessary computation a lot. The multi-screen sharing system with the improved encoder was designed and implemented. Experimental results show that the proposed method has increased the encoding speed and decreased the delay time significantly,while little loss in quality incurred if any.