Abstract: Transmitting data signal along low voltage power line is first time proposed. The design principle and implementation of the carrier wave data transmission system along low voltage power line and its corresponding receiver are discussed. It is shown that the single-chip microcomputer is very efficient in this field because of its high reliability, extensive generality, good antidistur-bance, low production cost and small size and so on. Therefore an approach to take further steps to apply the technique of remote measurement, remote control and remote information is suggested.