Abstract:At first, this paper briefly describes the development and characteristics of the site-cluster system.Then,it proposes a new solution in site-cluster system to overcome the shortcomings of current fourth-generation site-cluster system.According to the software engineering analysis and design method,this paper uses structured analysis method to analyze the site-cluster system of national Institute, and uses structured design method and three-tier architecture idea to design and implement the site-cluster system of the national Institute.Finally,it gives some forward-looking views on the analysis and design for site-cluster system.