The idea of \"evaluation of provisions\" has become commonplace in linguistic heritage; We can hardly find a book does not judge the use of a language or an opinion evidence by correction or error according to the grammar ,either in the direct semantics such as (correct) or (grammatical mistake), or other roughly transcibes , which differ semantically in the meaning of the" evaluation of provisions". Among these evaluation provisions is the rule of linguistic approbation. This study deals with the linguistic approbation in the interpretation of al- Durr al-Masown in the science of Inward Out book by Imam Abu Abbas Shihab al-Din, known as (Alsamien al-Halabi);by introducing two models of linguistic morphological studies approbation ,and two models of grammatical studies .That's of course after identifying the interpretation of " al- Durr al-Masown" and its author, Alsamien al-Halabi ,in addition to identifying the linguistic approbation and its definition according to the fundamentalists.