With the development of network technology, online learning becomes easier. But how to meet the need of learners' personality in network study is still a big problem. In order to support the personalized study better in the network environment, we take the personalized learning system as the research background. The artificial intelligence and cognitive technology were employed in the design and research of intelligent QA platform based on learners' personal model. Such issues as the model building based on learners' personality, and the designing of Intelligent QA Systems based on this model to present adaptive knowledge are mainly explored.