This paper analyzes the effect of Container style middleware on the structure and performance of Component-based system based on architectural patterns, and proposes an approach integrating Container style middleware components and their interaction relation into the application UML (unified modeling language) models. The performance model derived from the integrated UML models can reflect the impact of middleware. So, analysts do not have to know the internal details of middleware at performance modeling. The architectural pattern-based method can be extended to deal with various style middlewares. In the paper, the proposed approach is illustrated by a case study.