Abstract: Based on the analysis of the principle of MVC design pattern and MVC architecture, this paper discussed the application of MVC design pattern in NMS system development. An example is given to discuss how to use patterns in designing NMS and the structure of framework is illustrated. This design can not only make the logic processing procedure clearer, but also make the later expansion and maintenance easier. It can be applied facilely to the design of other application module of client, and bring better software architecture and reusability of code.