Abstract: Since refractory states of an excitable medium can be excited,depolarization is introduced into the Bar model.Depolarization effects on spiral waves are investigated.It shows that as threshold of depolarization and depolarization duration are chosen suitably,depolarization can induce drifting and meandering of spiral wave and even cause spiral wave moving out of boundary of the system.The dense spiral wave,two-arm spiral wave,twin speaks wave,multiple spiral wave and spatiotemporal chaos can also be generated with depolarization.Physical mechanism underlying these phenomena is discussed.

Key words: spiral wave, depolarization, excitable medium