Willing is one of the highlighted mores of Islam which sometimes based on the conditions take the form of obligation. One of the most important issues of the earlier ages of Islam is Imam Ali’s succession. A succession that has existed in the former nations as like. Such a succession takes a special sense when used about Allah’s saints that is caliphate and ruling after the prophets. By reference to the tradition resources of Ahl-Al-Sunnah especially Bokhari’s Sahih and Moslim’s Sahih we can reach a total understanding of Imam Ali’s succession which logically should be accepted by Ahl-Al-Sunnah. According to narrations recorded in the six Sihahah, initially and apparently the Prophet absolutely has not willed, but by a precise studying of the authentic narrations of the Sahihain, unlike the Sunni’s claim, Imam Ali’s succession will be proved and moreover, some of the Prophet’s companions and relatives has intentionally attempted to prevent him from willing and impair Imam’s succession.