Under the trend of the information/functionality integration, the application integration at the presentation and logic layers becomes a popular issue. Without the open Web service APIs, the integration of traditional Web applications is based on the reuse of UI components usually, which represent the interactive functionalities of applications partially. In this paper, we present some common problems of the current UI component-based reuse and integration, and propose our solutions: a security-enhanced “component retrieval and integration description” method. Our purpose is to construct a reliable large-scale reuse and integration system for Web applications.