National Grid is researching HPLC-based dual-mode communication technology for carrier communication blind spot scenarios, wireless communication blind spot scenarios and dual-mode convergence communication scenarios to improve coverage, broadband and speed of access network communications, and the various new business support capabilities of the ubiquitous power Internet of Things, etc. Protocol conformance testing is the key to ensuring the interconnection of communication modules developed by various manufacturers. In order to verify the protocol consistency of the dual-mode communication module in the later stage, a dual-mode communication module conformance test system suitable for three development stages was designed, and the design and implementation scheme of each module of the test system were detailed. Finally, the system function is verified by the single network networking test of CCO in Broadband Micropower. The results show that the system can fully automate the conformance test of dual mode communication module under different test modes.