In this paper,the effect of monetary policy on the Iranian economy have been studied with the use of the sysrem of near VAR eguation wich is based on the methodology of unobservable components and estimated according to the seemingly unrelated regression methd(sur).the results achieved through the estimate of the parameter of the model, determined a permanent reverse relationship between inflathion and unemployment that shows the effect s of monetary policy on the Iranian economy in both long run and short run. This result, in a way, demonsterates the conseguences of monetary policy in Iran. In this paperHODRICK-Prescont filtrring method has been with the Eviews.the determination of the OKun?’parameter on the Iranian economy is among the results achieved in this paper.