Some orientalists doubted the authenticity of Arabic grammar, followed by some Arab thinkers. In this article, I tried to show that the up-growth of Arabic grammar arose far from any foreign influence, whether this influence was direct from Indian culture or Greek culture, or indirectly through The impact of translations made by these two cultures at the hands of the Persians of the Syriacs, and I used in this matter the opinions of Arab and foreign thinkers who supported the emergence of Arabic grammar Under the auspices of the Arab-Islamic culture, such as: Muhammad Al-Tantawi, who acknowledged the originality of Arabic grammar. And Abdel-Fattah Al-Dajani, who refuted any Greek or Syriac influence on him. And Abed Al-Jabri, who tried to differentiate between the Aristotelian and Arabic categories. And Muhammad Khair Al-Halawani, who tried to respond to all those who claimed foreign influence on the Arabic grammar. Littmann, who showed that the Arabic grammar arose away from any for.
Keywords: Arabic Grammar, Supporters, Orientalists.