Abstract: To solve the problems of lack of process control in the development of existing portal system, high-cost in maintenance and long development circle in enterprise portal systems, in this paper, we propose a process-based enterprise portal information system model, and based on this model, we develop a system assembly tool using portlet and interpret the architecture of the tool in details, moreover the methods of XML-based component encapsulation and algorithms of page render and assembly are described.With this tool, user can select components of different types and different functions from portlet library conveniently.In addition, through click or drag, enterprise portal system can be easily assembled, thus the system development efficiency is greatly enhanced.