Abstract: The design of Semi-physical system for attitude control subsystem of the flywheel controlled satellite is proposed with the dSPACE real-time simulator,single-axisair-bearing(platform),on-board computer,gyro and flywheel.Then the proposed system is used to the semi-physical simulation of large angle maneuver attitude control for small satellite only via flywheels.The results indicate that the control algorithm can satisfy the requirements of the AOCS(subsystem).