To describe requirements of electromagnetic spectrum management system (ESMS) accurately and completely, the models of the system are described in the aspects of business requirements, technology requirements and functional operation requirements, based on studying the structure of ESMS and its workflow. The process of constructing models of ESMS requirement is discussed in detail by means of Extensible Markup Language (XML) and the relationship diagram of UML, and the general model of datagram is presented, in order to realize interoperability. The results show that the models can effectively reduce the complexity of information exchange among functional units within system and systems, but also take full account of all the functional requirements of potential users.