H.264 KTA（key technology area）在提供更高视频编码性能的同时，也大大地增加了视频编码的计算复杂度。其中，1/8像素运动补偿技术和分数点自适应插值滤波技术的采纳使分数点运动估计占用总体编码时间的比例越来越大。提出一种快速分数点运动估计算法。该算法利用分数点残差曲面的单峰特性和整分数运动向量的相关性，优化搜索模板和搜索的起始位置。根据在H.264 KTA上的实验结果显示，新算法在大幅提高计算速度的同时，保持了与全分数点运动估计算法相当的率失真性能。

H.264 KTA increases the coding performance at the cost of high computational complexity.Its adoption of adaptive interpolation filter（AIF）and 1/8 pixel MV resolution causes that fractional pixel motion estimation（FPME）exerts more significant influence on the computational complexity of video coding.In this paper，we propose an algorithm to speedup FPME by using uni-model characteristics and the MV correlation of fractional pixel motion compensation.According to experiments，our algorithm achieves much higher speed than other fast FPME algorithms with neglectable R-D lost compared with F帧/s algorithm.