this letter was Submitted to the University of Nizwa. Faculty of Art. Science. Arabic Language and Literature Department. Requirements Complement for obtaining a master's degree in Language Studies. I Traced the impact of Kufa grammarians on Basra grammarians till the end of the fourth AH century and divided to: Preface, three chapters and a conclusion Preface: I spoke briefly about the standing -based genesis as the assets for both schools and some of the causes of impact and affectability. Chapter II spoke about the Kufa school terms that appeared in their impact through Basra grammarians use Chapter II / Kufa grammarians impact on Basra grammarians in the speech parts. And divided to three sections: The first topic / Kufa grammarians impact on Basra grammarians in names. The second topic / Kufa grammarians impact on Basra grammarians in( acts or effect). The third topic / Kufa grammarians impact on Basra grammarians in letters. Chapter III / Kufa grammarians impact on Basra grammarians in the factors. And divided it in two sections: The first topic / Kufa grammarians impact on Basra grammarians in verbal factors. The second topic / Kufa grammarians impact on Basra grammarians in moral factors. Conclusion / spoke about the main results reached by the search. The research methodology tracks the opinions of Kufa grammarians from their origin of their books sources which was brought to us from what I was able reach. Depending on what reassured piece than attributing the views of the references to them when they do not stand in the opinion of their sources. Then trace the influences of Basra grammarians due to the original books..References in case they could not source to elucidate the statement effect