This work is about media discourse, especially religious discourses on senegalese radios. We decided to work on this subject because we have noticed that religious leaders use the public as well as the private airwaves to convey their messages. These leaders have developped several skills to become popular and to keep and convince their faithfuls. The purpose of this thesis is to get an insight into the leaders’ messages on the religious, social and cultural domains and also to find the tools they use to reach their goals. To carry out this work, we have collected a corpus of 29 broadcasts from two hosts. Among these broadcasts, 12 are non interactive. The others are interactive and concern the listerners (12 broadcasts), the guests (two broadcasts) and the co-hosts (three broadcasts). First, on the structural level, we based ourselves on the sequential approach borrowed from the conversationalists. We were so able to identify the rituals, which are very important and allow to see the different roles and places of all the participants. We also found that these discourses are based on discursive diagrams used by both hosts. Their objective is to present certain facts, but, above all, to convince the listeners. This construction marks their desire to produce a pedagogical speech. Was also realized a content analysis to bring to light the main topics discussed during the broadcasts, this allowed us to see that the religious hosts don’t concentrate only on themes connected to the religion but, they also deal with social, historical, political questions, etc. Then, to show the interpersonal relation between the hosts and their various participants, we analyzed the terms of address and the speech acts. It emerges from this study that the various participants build a harmonious relationship. We finally identified the various figures, which come into play in the construction of the hosts’ discourses. This analysis helps us to determine that the hosts combine ethos, logos and pathos to convince the listeners.