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The on orbit state control of spacecraft is an important support to ensure its safety. In this paper, the baseline control system for on-orbit spacecraft is designed and developed around the unit state, software version, working pattern and autonomous function. By the design of database logical separation, distributed deployment, data publish/subscribe, etc. the system realizes the real-time comparison between the flight state and the baseline of on-orbit spacecraft, which can help engineers quickly find the abnormal flight state of spacecraft; at the same time, it records the baseline change of on-orbit spacecraft, forms the baseline change history of on-orbit spacecraft, and realizes the record and traceability of the baseline state change of on-orbit spacecraft. The real-time monitoring of flight state is a beneficial supplement to the traditional telemetry monitoring and provides a new reference for the development of the telemetry monitoring system.