PLANET-C is the ISAS's first VENUS probe. Since PLANET-C is a small three-axis-stabilized spacecraft, the disturbance torque due to 500N Orbit Maneuver Engine (OME) is a big threat for attitude control. In order to manage the disturbance, various disturbance suppression control schemes have been designed for comparison. A new class of scheme, transient suppression compensator, may overcome the problem.