This study aims at presenting the methods which Al-Jahidh used to convince his interlocutors of his thoughts, and to achieve that the researcher used the argumentative approach and its theories which make the fundamental aid into the presentation of the argumentative methodologies. The researcher used the argumentative approach depending on Pearlman and Dicro argumentative theories at language and the well-known Arabic studies at this area such as the work of Abu Bakri Al-Ezawi, Abdullah Saula and the published studies in Hafidh Ismail Alwai's book of group argumentation and many other practical studies on the same approach. The researcher also used specialized dictionaries such as discourse analysis and encyclopedicdeliberativedictionary to control the terminologies that relate to the method being used. The research blog determined by Al-Jahidh's spoken letters that he classified on Abu Milham. The study is limited to eight letters which are: Al-Qayyan a response to Christians, the response to incarnations, the rejection of incarnations, speech industry etc. it answered the following questions: 1- What techniques Al-Jahidh used to convince his interlocutors at his letters? 2- How did Al-Jahidh employ rhetoric techniques (as he is one of its scientists) for persuasion? 3- Areconvincing speech specifications achieved in Al-Jahidh's letters as seen by argumentative approach? 4- What tools has Al-Jahidh used as proofs to change interlocutors" beliefs? The study found the following: 1- The interlocutor used the language and what is has of tools to achieve his convincingtargets such as the reasoning tools, the condition and the questioning, the commanding and the argumentative links. 2- The argumentativeapproach can present an interpretation for some methodological phenomena at the Al-Jahidh's writing such as the phenomena of the for andagainst an idea as the argumentativeapproachpresentsthat the investigation of the opponent argument. This to show the areas of weakness in it and therefore to destruct it so his proposal can be built on it. 3- The interlocutor in the blog is the speaker's made even when he/she is at the argumentation or shows as a dependent on the speaker to respond to a group as it is in the responding letter to the Christians. In these letters all the interlocutors are the speakers outcome. The different shapes of the interlocutors are no more than ways used by the speaker for thoughts convincing according to interlocution needs.