This paper presents a control strategy of all-speed fin stabilizer, and studies the switch principle between low speed
and medium speed. To avoid the complicated control law in zero or low speed, lift force feedback is adopted to eliminate
the uncertainty which exists during the transformation from fin angle to lift force. The ship rolling motion model, which
is a nonlinear uncertain system, is linearized to time-varying system by T-S model. The constrained nonlinear optimizing
problem is transformed to quadratic programming problem. Thus, the online nonlinear optimizing for predictive control is
avoided. The control strategy and switch principle are proposed based on the design of all-speed fin stabilizer for a ship.
Simulation results show that this method is able to satisfy the requirement of all-speed stabilization.