With the continuous upgrading of communication technology in low-voltage distribution network, dual-mode communication combining high speed power line carrier (HPLC) and high speed wireless communication (HRF) has become the most critical communication technology in the field of low-voltage power grid. This paper deeply studies the interworking technology of dual-mode communication, analyzes the detection scheme of dual-mode communication, and designs a dual-mode standard transceiver unit. To realize the data interaction with the user platform system, analyze and convert the platform data message into MPDU frame, realize the processing functions of carrier or wireless MPDU frame analysis, coding, modulation, etc., and carry out simulation verification to realize the protocol consistency test of dual-mode communication unit.