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Context awareness is an important part of mobile and ubiquitous computing research. Most of the existing studies have concentrated on technical implementations. There is a considerable gap between systems context-aware actions and human expectations. We made an Activity-based Context-Aware Model based on Activity Theory and human situation awareness theories. Activity-based Context-Aware Model based on Activity Theory describes human context awareness within activities, which could offer more accurate understanding of human context awareness and help the development of context-aware technology. This paper defines the Activity-based Context-Aware Model based on Activity Theory, and presents a case study of shopping activity, which initially verifies the validity of the model.