The systematic structure and opera-ting principle are analyzed and the universal agent functional module is presented. The controllable predictive fast search algorithm for block matching motion estimation adopted in data compression group and the motion vector recovery algorithm adopted in error control group are demonstrated. 分析了系统结构与工作原理,给出了Agent的功能模型,并对模型中数据压缩组(DCG)和错误控制组中所分别采用的自适应快速运动估计算法及精细运动矢量场差错掩盖算法进行了介绍。