The purpose-built plan named" purposeful plan of subsidies is one of the basic and radical plans of 9 th state. This plan goes back to two years ago. Since them the state determined and urges to omit the subsidies. Owing to economic system is a complicated intervowen set of factors and ingredients, studing and analyzing such a policy case needs a holistic approach, so in this research I have studied the effects of omitting or reducing the subsidies upon main economic variables such as economic growth considering supply side(value added of main sectors of economic including mine industry, agriculture, services and oil) also demand side(consumption, investment, governmental expenditure and net export) and the last inflation rate. Finding in this research according to my built model and analyzing subsidies policies indicate that there are a lot of structural problems and economical difficulties in iran economic system I should point out that most critical economic problem is dependency of existing economy trends to governmental subsidies both in supply and demand sides. Among policies that were analyzed the best policy still is duration of previous trend and policy. However this condition is not acceptable and it is problematic itself! But if we say" basic simulation is best" this sentence don’t approve the existing situation and trend .our economy has deep structural difficulties so that it is preferred before hurriedly omitting the subsidies, such structural problems should be solved and removed .in this way subsidies would be omitted step by step in order to avoid acute economical reactions and even social and political tensions. The negative effects of outcomes of omitting the subsidies of commodities is less than non profitable allocation of energy, but worst policy which definitely play a very negative role on economy growth trend is omitting the subsidies of commodities non profitable energy quota simuta Key word : system dynamics, subsidies policies, economic growth, inflation rate