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Terminal cooperation can make up for the deficiency of single terminal in perception, communication, computing, service presentation and other aspects. This paper enumerates typical application scenarios of terminal cooperation in ubiquitous network, and key tecnologies in terminal environment need to be studied are also analyzed. Following that, a framework of terminal middleware is put forward, including service demand processing, service discovery, context-aware, data processing, cooperation control, safety control and other functional components. Finally, based on the above method, we have developed a terminal cooperation application system, which demonstrates the cooperative downloading of multimedia files.