Abstract: It is one of the key problems in the telescience technology of the space application that the real-time transmission of large amount data is achieved under the condition of the constrained message channel bandwith.A new idea is presented by combining double-bus with double-buffer.It is realized to provide the video image real-time seamless transmission and active teleoperation under the constrained condition of the fixed transmission protocol and message channel bandwith.As some key technologies have been solved,the high qualitative video image sequence can real-timely be redisplayed (when video image data is compressed to 20fold,the signal-to-noise rate is 38dB) at 2Mbit/s on ground according to CCSDS (Counsel Committee of Space Data System) bitflow protocol.