In order to meet the needs of large capacity, highspeed, and multipayload data transfer, the data transfer system of the FY3 Meteorological Satellite adopts AOS (Advanced Orbiting System) standards recommended by CCSDS (Consultative Committee for Space Data Systems). Based on the concept of virtual channels, the multiplexing and bitstream services are provided to different types of payload data. The application results show that the two types of services meet not only the requirements of multiple highspeed transfer rates, but also the requirements of multipayload data transfer with different amount and formats. Based on the AOS protocol, the transfer frame format and the coding mode of FY3 are introduced.