Abstract: The design of software architecture has hiberarchy in which different level has different abstract, the software architecture of adjacent two levels defines certain conversion relation. The layer semantics of software architecture is analyzed from the views of topology and computation, including cause relation between adjacent layers.

Key words: Software architecture; Topology; ADL; Layer semantics

摘要： 软件体系结构设计具有层次性，不同层次软件体系结构抽象级别不一样，相邻两层的软件体系结构存在着确定的转换关系。从拓扑关系和计算关系的视角分析了软件体系结构的层次语义，说明了相邻层的软件体系结构具有因果连接关系，上层是下层的抽象、约束，下层是上层的具体化、解释。

关键词: 软件体系结构；拓扑；ADL；层次语义