This dissertation studies and reviews a manuscript in conjugation entitled "Explanation for the Children Upbringing Poem using conjugation" by Sheikh Muhyiddin bin Sheikh bin Abdul Sheikh Al Qahtani Al-Barawai, who died in 1286 AH. The dissertation is divided into two parts; the first includes the study, while the second includes the review . The first part consists of three chapters. The first chapter provides an introduction about the author, his life, legacy, writings, and disciples, while the second chapter studies the methodology adopted by the author in the book including his conjugation system, an explanation for it, his references, sources and terminology. The third chapter describes the manuscript, provides a practical explanation about the review, as well as the conclusions of the study . The second part of the dissertation includes the reviewed text. It is primarily based on a conjugation system drafted by the author in one hundred and sixteen poetic verses. The author has named this poem ("Explanation for the Children Upbringing Poem along with conjugation"). After that, the explanation falls in five sections, eleven chapters and a conclusion. I have attached to the reviewed text an annex including the ("Explanation for the Children Upbringing Poem using conjugation"), in addition to some documents handwritten by Sheikh Muhyiddin depending on technical archives . The most important conclusions of the study are as follows -: -The study and review of the ("Explanation for the Children Upbringing Poem using conjugation") is an endeavor to approach the linguistic heritage of the North African authors in the reign of Sayyid Said bin Sultan. It also seeks to highlight the methodology adopted by the author in linguistic studies. -The study has unveiled a new conjugational system, i.e. ("Explanation for the Children Upbringing Poem using conjugation"), written by Sheikh Muhyiddin Al-Qahtani Al-Barawai . -Sheikh Muhyiddin used a recognized academic way in his explanation. He adopted a methodology based on brevity and the frequent use of conjugation rules.