It is necessary for computer to have a large knowledge base, while a lot of practice has proved that computer more needs broad knowledge interconnection in order to really realize intelligence. MindNet has dealt with the semantic path, which is kind of word-interconnection. In National Knowledge Infrastructure (NKI), we regard a closed-semantic statement as a whole knowledge unit, and discuss the interconnectivity between two statements.Knowledge interconnection is necessary in the view of knowledge engineering, and is feasible in the view of cognition and semantics. In this paper, we firstly introduce concept-relation-model, which is a suitable knowledge representation model for knowledge interconnection, and then we discuss knowledge interconnection based on the properties of relations in CR-model.
