Abstract: The organization and the properties of a Multi-Agent System(MAS) which is based on KQML speaking are firstly analysed in this paper. Then, we propose a MAS model which is based on Contract Net Protocol(CNP), and an Agents Communication Model which combines with KQML and CORBA is also provided. Lastly, via analysing the formal expression of KQML in a simple application of a scheduling system, we confirm the feasibility of these CNP models.