Abstract: Modified Bär model is used to study suppression of spiral wave. Methods of suppressing spiral wave by two-stage pulse force control are proposed. In the first stage,fast variable of the model is acted by a positive rectangular pulse force. In the second stage,direction of force is changed to the opposite or the force is acted on the slow variable. It shows that two-stage pulse control method is more efficient than one-stage method,and magnitude of the force is 38%~55% of the latter. It suggests that two-stage method of control of spiral wave can improve defibrillation efficiency.

Key words: excitable medium, spiral wave, pulse control