The research aims to View One of the Phenomena of Arabic language which is Follow –up and mating. We do not forget that one of the greatest scientific gifts is that you are absorbed in one aspect of a science, and if you are guided to another aspect of it, then you draw from what other scholars have invented, and this is what I am in the process of exposure to it. While I am Searching in specific field , I find myself standing on a sub-topic for which effort and time deserve to be exerted , namely following and mating in Yousef Bin Ibrahim Ibn Ismail ' s book (d: After 812 AH ) a linguistic lexicon in which the author followed the approach of authenticity and its school of writing, So I explained the limit of following, and mating each separately, and the types of following and mating in the chapters (Al Jeem Al Haa and Al khaa ) so I have succeeded in that way.