Iranian economy as a state – petroleum economy with inflation and budget deficit challenges pass big and small Business Cycles in the last three decades. Obviously recognition of significant causes of these Business Cycles can to help to programmers and policy makers for the more accurate and efficient offers. This research by using of Structural Vector Autoregressive (SVAR) model recognizes The Effective Causes on Business Cycles of Iran. The conclusion shows between 1990 & 2012 budget deficit growth and real exchange rate growth were the most important causes of Business Cycles of Iran. According to this conclusion macroeconomic policy makers should attention to these causes for gaining more stability.