Power line carrier (PLC) communication is the peculiar mode of communication in electric system, this paper introduces a research of two OFDM-based PLC communication standards PRIME and G3-PLC, analyses their processing procedure in physical layer and makes comparisons of their similarities and differences, and then contrasts their communication performance with each other. Finally, actual tests of PLC products which separately conform to PRIME and G3-PLC standards are performed and the test results are provided, which gives a reference of the selection of PLC communication standards in different power line environments.