Abstract: To analyze the attenuation of the reaction wheel disturbance in the vibration isolation system, the isolation performance of the satellitic flywheel is analyzed based on the power flow theory. The dynamic model of the system under a flexible base is first built. Then the power flow expressions of this system are derived and the effect of the structural parameters of the isolation device on the power flow transmitted into the subsystems is analyzed by the numerical simulation. The results can be used in the optimization design of the system structure parameters.