Abstract: Investigates the design structure of a data exchange system in Web application. It makes use of a struts architecture based on the model view control structure , and controls the direction of data flow on an actionservlet class, which offers an entrance for all http requests. The control component fills the corresponding parameters in the form bean, and the form bean validates these parameters. After success, the form bean sends these parameters to the action class. The Enterprise JavaBeans realize all the data exchange business and manage the distributed data resources. Then the action class decides to select the page in view by invoking enterprise Javabeans. Finally, the action class transfers the control power to the consequent JSP page, which generates the view. This design structure separates the business logic from the page, so it is of advantage in developing and maintaining the system.