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In this thesis, the traditional reverse method is applied to TTCN-3 test systems. The discovery system of inverse model is designed, and the discovery technology of test configuration models is also discussed. When reverse analyzing the test system based on TTCN-2, the test configuration information can be obtained from two aspects, namely static and dynamic. Then the discovery algorithm related to the areas is developed. The abstract model describing the test systems will be extracted. The reverse engineering based on TTCN-3 test systems can help testers grasp the system design from higher levels, and can test the consistence between test design and test implementation, which is of great significance and important value for test system maintenance, expansion and evaluation.