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Commercial-off-the-shelf components (COTS) are widely reused at present and black-box composition is the unique way to integrate them into the target system. However, various mismatches among components often hamper the integration of COTS. While the existing approaches to modeling software systems often neglect the issue of COTS component-mismatch detection and elimination. Aiming at solving this problem, this paper proposes an adaptive software architecture model. Based on this model, we first analyze and conclude the mismatches among heterogeneous components, and then we propose the corresponding solutions to eliminate these mismatches and provide a seamless integration for COTS components. At the same time, we employ an example of Web-based application system to illustrate the efficiency of our approach.