Lots of Papers has been written about Iran’s Military Strategy explain Military strategy of Iran is Deterrence, but there is a little Paper that Explain Why Iran Chose this Strategy? The Paper tries to Answer this Question. Two Hypotheses are presented as Probable Answers to the Question: 1-Chang of Balance Power in the Middle East 2- Intensification of U.S Pressure on Iran for Regime Change.Lots of Papers has been written about Iran’s Military Strategy explain Military strategy of Iran is Deterrence, but there is a little Paper that Explain Why Iran Chose this Strategy? The Paper tries to Answer this Question. Two Hypotheses are presented as Probable Answers to the Question: 1-Chang of Balance Power in the Middle East 2- Intensification of U.S Pressure on Iran for Regime Change.