Transmitter is one of the communications-equipment in modern industrial. The basic principles of the transmitter is described in this article at fist, and then the multi-carrier multiple smart grid electricity transmitter is proposed. The transmitter takes advantage of multi-carrier communication technology and more effective solution to solve measurement data transmission problems in smart grid. In the carrier module, the source information with high-rate is changed into low-rate parallel data streams, and then is modulated, the modulation signal is added and changed into transmitted signal, and each carrier can use different modulation. Low-speed data is demodulated by appropriate demodulation mode at the receiving end, and then original data stream is synthesized by parallel -to-serial conversion.