Jauhar Al-Maknun is one Book in Balaghah that teach at Ma’had Baitusshabri. Some students difficult to understand it because it is written in syi’ir verse and has a little examples. In addition، teachers who teach in Class VI do not use Learning Media that makes it easy for students to understand their contents. The purpose of this study was to determine the effect of the use of Jauhar Al-Maknun Book by using the mind mapping to the mastery of Balaghah in the Insya Chapter '. The research method used in this study is the Experimental Method. And the sample in this study was Class VI students، amounting to 15 students. The result of the study indicate that the learning of Jauhar Al-Maknun Book by using mind mapping influences the mastery of Balaghah in the Insya Chapter '.