In this paper, the adapters for Linux operating system are developed based on C language, whose purpose is to realize communications with TTCN-3 platform. Meanwhile, it can also call local API or service commands. In order to record and analyze execution steps of interoperation between operating systems, the adapters should be called following the synchronism and satisfying real-time verdict on test execution result. In the actual execution, test system firstly sends a command to the adapter on operating system, and then the adapter executes the command and returns result. After setting the test verdict according to result, test system sends next command to the correlative adapter. Fig. 6 shows the entirearchitecture of interoperability testing.