years ago, Noma first applicated the patch\|clamp technique to CN\|treated mamammalian heart cells,evealed specific K + channels which were depressed by intracellular ATP at level greater than 1 mM.He suggested the ATP-sensitive channels are important for regulating cellular energy metabolism in the control of membrane exitability.Recent studies supported the hypothesis and suggested that ATP-sensitive channels play an important role in hypoxia,myocardial ischemia/reperfusion and is chemic preconditioning.