The Iranian nuclear issue has drawn attention of the international society. As the two major sides in conflict，Iran insists in developing nuclear technology while the United States asks the former to give up its nuclear program and manages to mobilize other big powers to act in a concerted way. Ultimately，this has led to the sanctions of Iran imposed by the UN Security council. The United States does not exclude the possibility of appealing to arms. The Iranian nuclear issue has cooling down to some extend after American intelligence agencies indicated that Iran had stopped nuclear weapon program. However，the international society is still suspicious about Iranian nuclear program as Iran has not stopped uranium enrichment. Therefore，the issue remains unresolved.