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For Large manned spacecraft, such as future space station, the traditional wired head voice communication system is unable to meet the application requirements of the astronauts due to the length limit of the cable. In order to improve the convenience of the astronauts in orbit, a wireless voice communication system in cabin for manned spacecraft is proposed, which realizes wireless function expansion on the basis of the existing voice system of the manned spacecraft by setting the Bluetooth wireless voice adapter. Test verifications show that the system can support multichannel wireless voice communication, clear voice can be heard through the system, and it has many advantages such as high real-time and easy operation. Astronauts’ demands of voice communication on orbit can be satisfied by the wireless voice communication system.