A system for carrying out signal distribution using indoor television cable, includes indoor cable, cable deconcentrator, branching cable, terminal signal box, filtering composite module, WLAN access point AP and modem, the filtering composite module completes introducing down wireless local area networks signal, down Ethernet signal and television signal, these signals are output to the cable deconcentrator after filtering and mixing, then distributed to each terminal signal box; the terminal signal box is signal spread box, which separates down LAN signal, television signal and down Ethernet signal in the composite signal, and outputs them to the interface, the Ethernet signal and the wireless local area network signal are transmitted in two-direction in the system. The present invention transmits three kinds of signals at the same time through television cable which is indoor widely, and three kinds of signals are non-interference.