Abstract: To ensure the reliability and safety of the astronaut-spaceship-spacesuit system, a simulation test must be performed adequately on the ground. The synthetic recharge system (SRS) provides a reliable test environment for the astronaut activities. The new and highly reliable control system insures the test being carried out correctly. The PCS7 process control system is designed with all the crucial equipments being rendered backup, which makes sure for the SRS controlling flows being carried out reliably in both normal and abnormal states.