"Historical authenticity of tradition" is the main topic of what professor Muhammad Ali Mahdavirād presented as a lecture the conference“Fields and Methods of Tradition Research". At first, he mentioned the status of the Prophet (S.A.W.)’sSunna in Islam and considered the authenticity of Sunna as what all Muslim scholars acknowledge and are unanimous about. In the next part, by insisting on the Muslims’ effort onpreserving the Sunna, he rejected the orientalists’ raised doubts about historical authenticity of tradition, and propounded that, despite the government's prevention, writing and compiling the traditions is aninevitable truth.