A new output-feedback control approach for the single-axis rotational maneuver of a flexible structure by use of on-off thrusters is discussed. The target Structural model represents a large-space-structure type with relatively low natural frequencies. The large overshoot induced by phase error of the applied torque input is minimized by the new control law. The thruster output is modulated in pulse width so that the output profile is similar to continuously smoothed control histories. The main idea of the new controller is based on a dosed-loop switching function that is constructed from a near-minimum-time output-feedback tracking control law. The preposed control law has advantages of robustness as an output-feedback law as web as enhanced performance for the slew maneuver of flexible structures by use of on-off actuators.