Rolling is an undesirable motion for ships. Large amplitude rolling can easily lead to capsize which will cause the loss of life and property. This paper proposes a fuzzy-extension control strategy for ship roll damping and anti-capsizing system. Fuzzy control strategy is studied in the classical domain for rudder roll stabilization to solve uncertainties in quantitative change and gradual change resulting from the change of ship model parameters so as to improve control performance. Moreover, the real-time tuning algorithm is presented to tune the fuzzy rules. Extension control strategy is studied in extension domain to solve the uncertainties in non-gradual change arising from the wave so as to extend anti-capsizing control sphere. Every control strategy can realize effective control within the scope of control.The two intelligence control methods are combined to increase the level of intelligence of system. This paper carries out the simulation under various situations such as different navigation speed, sea conditions, encounter angle and ship parameter perturbation, to test the roll reduction and robustness of the roll controller designed.