According to the smart grid’s “informatization, digital, intelligent” requirement, this paper designed a new power metre based on power carrier communication. First it introduced the prinple of the carrier communication, and detailedly elaborated the working principle and function of the power meter, adopting high precision “energy metering ADE7755+microprocessor chip” plan to realize the measurement of the power parameters, monitoring and adjustment. In the end, the system error analysis were elaborated in detail. Priliminary tests showed that the power meter accuracy in measuring, the performance was good, intelligent, and meet the design requirements.