Persian Gulf is one of the most important parts of Iran, which is one of the most important economic veins in Iran. On the other hand, a person such as Sadid al-Saltanah has left the legacy of the Persian Gulf and the events that are among the most realistic works. He criticized the events and criticized the scholarly methods and pointed to all the cultural, social and political affairs in this regard. This research intends to recognize the historical works of Sadid al-Saltanah, his historiography method, factors influencing his writing style and his historical attitude, and by studying the new features of historiography in his works, he has his place in the history of the evening Qajar, as well as Persian Gulf historiography.