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The implementation degree of software interoperation is fundamentally determined by interoperability between operating systems. For the purpose of meeting the requirements of software interoperation, this paper proposes that the nature of interoperability testing between operating systems is API testing relating to interoperation functions in operating system. On this basis, we lead the mature theory of protocol interoperability testing into this paper, and put forward test strategy, test model, test case design, running environment and evaluation classification for interoperability testing between operating systems. The entire testing process above can be achieved on TTCN-3 and gains some evident effects in practice.