The Shiite Crescent，a term coined in 2004 by King Abdullah Ⅱ of Jordan，means an area extending from Iran through southern Iraq to Syria and Hezbollah in Lebanon. The creation of this term reflects the structural change of the geopolitical situation in the Middle East，and should also be understood as a new chapter of sectarian conflicts in Islamic history. Iran is working hard to provide support to Iraqi Shia Muslims and contain US influence in Iraq，and trying to divide the Arab world and counterbalance Israel through an Iran-Syria-Hezbollah triangle.