With the popularization of network technology and higher level educational information, education in the field of knowledge management has become a research hotspot. The knowledge point is an essential cell which transferred information in teaching. Automatically extracted from the network a lot of teaching resources in knowledge and information, and then translates the information into the corresponding elements of topic maps. A model of educational resources knowledge management based on topic maps is put forward. The method of semantic relatedness of topic maps evaluation among topics and between topic and resources to be studied, which can be applied to knowledge services. For example, knowledge navigation system, constitute the new navigation system, the precise concept of association, narrow the search space, returns the sorted result set, enhance knowledge retrieval, efficiency and accuracy of navigation.