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Power line communication technology is developing from narrowband to broadband, and broadband power line communication has become a hot spot in the research and application of power line carrier communication in recent years. Protocol conformance test plays a necessary and important role in guaranteeing that broadband power line communication devices meet the standards and achieve interoperability. A broadband PLC conformance testing system is designed based on TTCN-3 framework and Titan development platform. The software and hardware implementation scheme for conformance testing platform is proposed and the mechanisms of each module as well as key techniques are described. Different test cases aiming at PHY layer, MAC layer and APP layer are designed according to broadband PLC protocol, and finally test cases are executed based on testing environment. The work is of significance for promoting the broadband PLC standardization and interoperability.