This study is about the narrations of Abo-Obaida Mamar Bin Al-Mothana (His death: in 211 Hejria) in the Arabs tongue for Bin Manzour (His death: 711 Hejria) Study for the theory of the evident fields. This study consists of an introduction, Simplifying, two chapter and conclusion (it includes the most important result) which the researched has reach.in this study, I depended on the analysis and evident curriculum. Also, some processes which relate to the evident survey with an explanation of the relations among the synonyms in the same field. I depended on the old dictionaries and the new 600, which relate to the theory of the evident fields and the science of evidence.and these are the most important results which I reached in brief. 1. The progresses of the Arab heritage and linguistic thinking for the Arabs. The theory which western scientists have reached. Which is known as the theory of the evident fields. 2. The science of evidence is the science of study the meaning and it is a science which researches the meaning of the word and sentences. 3. The rate of the benefit and the depth of theory of evident fields, which I could organize the narration which were narrated by abo- obieda theory it, a very accurate organization. 4. The existence of a closing connection between the synonyms in the same field which gives the importance of the study of the evidence relations which connect them. 5. Gathering the word inside the evident field and distributing them discover the gaps of the dictionaries which are found inside the second field. 6. The evidential field was for the phrases which related to horses. And it was the biggest field of the study.