In　this　paper,　under　the　hypothesis　that　is　upper　bounded,　we　construct　a　Lyapunov　functional　for　the　multidimensional　isentropic　compressible　magnetohydrodynamic　equations　and　show　that　the　weak　solutions　decay　exponentially　to　the　equilibrium　state　in　L　2　norm.　Our　result　verifies　that　the　method　of　Daoyuan　Fang,　Ruizhao　Zi　and　Ting　Zhang　[1]　can　be　adapted　to　magnetohydrodynamic　equations.　©　2012　Wuhan　Institute　of　Physics　and　Mathematics.