Ambient演算的一种分层语义，网络计算系统中涉及的操作复杂，很难直接给出一种的语义描述框架．作为一种网络计算模型，Ambient演算主要刻画了计算的分布性和移动性．-Since computation under network involves variants，complicated information and behaviors，it is difficult to give denotational semantic descr iption for computing under fretwork.