Quantum communication is an unconditional secure manner of transmitting information. A system of space information based on quantum entanglement is presented. It is using stratospheric platform and geosynchronous satellite as quantum repeater to deliver entangled photon pairs. The communication link between sender and receiver is built by quantum entanglement, and quantum information is transferred by the principle of quantum teleportation. The characteristic of the system is discussed, and numerical analysis is made for the performance of transmitting information. The result shows that the system can effectively transmit information in security.