Many endeavors have been made to build macro-econometric models for Iran, but the problem of macro-modelling is not just putting equations beside together. The closure of the model and the links between the variables throughout the model and its simultaneity is the most important part of simultaneous system of equations. Structural versus time series models are based on different approaches of Cambridge and Chicago schools to formulation of economic phenomena. The former is based on logical foundations of economic theory and is best for policy analysis, though the latter focuses on empiricism and predicts the future better if economic structure remains unchanged. The version 6.1 of the Macro Econometric Model of Iran which is a structural model is still at the end of all structural models of Iran and has been using for many policy analyses for domestic economy and international scene policy simulations as LINK project of the United Nations. Macro Econometric Model of Iran is a fully analyzed built structural model and can be used as a base for development of macro or sectoral structural econometric model for Iran and also as a framework to be used for adaptation in other countries.