This paper investigated how the appropriate environmental policy may change during a long-term macroeconomic planning and under different policy weights. For this purpose, a simple general equilibrium model has been established. Results showed that choosing the appropriate policy is depend on preferences of government; so that when weight of environmental factors in policy making is less than 40% (weight of economic factors is more than 60%), lowland food production subsidies policy is preferable policy and when weight of environmental factors is more than 40%, upland food production tax policy is appropriate policy. Base on results of this study, as the weight of environmental and economic factors changed in this paper, one can think about changing the weight of any of economic factors. For example, if PPI doesn\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'t have any importance in policy making, it can be eliminated and if government wants to give more attention to consumer prices than producer prices, policy maker can set the weight of CPI more than that of PPI in ranking.

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