Fan Wenlan believes that the phenomenon of ethnic integration still exists in history. During the separatist period caused by wars and massacres in history, there were both cruel struggles and ethnic integration. Struggle and integration go hand in hand, and when struggle is completed, integration is completed. The Han nationality is further developed by adding fresh blood. From the battle of Huangyan in ancient legend, to the battle between Huangdi and Jiuli Chiyou, until Manchu entered the Central Plains, almost without exception, it shows that national struggle is the only process of national integration. Historically, the Han nationality seems to be a melting pot of all ethnic groups. The reason why the Han nationality has become a huge nation is that it has been absorbing various ethnic groups nearby for thousands of years. Fan Wenlan also emphasized that it is a good thing for ethnic groups with lower economic and cultural level to integrate into ethnic groups with higher economic and cultural level, which is progressive in nature. Historians don't have to avoid this point.