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Context is important in personal knowledge and social knowledge construction process. Context awareness means being able to collect environment and learning resource information from the learner and surrounding equipment to provide learners with the context-related learning activities and content. The context elements, including intra object, inter-object, session, social systemic, economic techno-physical and history contexts, in mobile learning (M-learning) are discussed in detailed. And then context ontology is constructed according to these context elements based on ontology technology. Context reasoning is the key of context awareness. An ontology-based context reasoning approach which combined Case-based reasoning method with semantic knowledge organization approach is presented in the paper.