On Qin is a political treatise by Jia Yi, a writer of Han Dynasty, not a Han Fu. Han Fu is a literary form that appeared in the Han Dynasty, mainly describing natural scenery and expressing emotions. On Qin is a political essay with the theme of analyzing the faults of the Qin Dynasty and summing up historical lessons, aiming at providing reference for the establishment and rule of the Han Dynasty. The article is rich and profound, and its thoughts touch people's hearts. It is regarded as an important chapter in China's ancient political culture. Therefore, it can be clearly said that the theory of Qin is not Han Fu.