Since long ago, coasts and islands of Pars sea have been one of the influential and important areas in politics, economy, trade and huaman culture and civilizatin. One of the shining periods of political and economical life of Persian Gulf has been long governing of king Hormuz. In fact, his migiratin to Jeron island that occured in coincidence with Mongul attack to midsouth of Iran is the beginning of majestic and splendour period of Persian Gulf.The splendour which achieved to its hight in 8 century and presented Jeron island. Wher is now called Hormuz as the biggest center of business and trade and the most important area for goods exchange in India ocean and Persian Gulf . to the entent that Hormuz in this period was called "key of Persian Gulf " . this study aims to investigate trend of change , policies and actions conducted by Hormuz kings for establishment and formation of situation Hormuz island .