Horse race. In Liaodong area, Manchu horse surnames are divided into two different blood groups: Han flag bearer and Manchu flag bearer. Because two different blood groups have the same surname of China and live in Liaodong area, it is very easy to be confused in bloodline. Ma surname in the flag of the Han army refers to the original clan of Ma surname of the Han nationality who joined the Manchu in the middle and early Qing Dynasty because of surrendering prisoners and other reasons. After the Manchu was incorporated into the Eight Banners of the Han Army, they also compiled genealogy like all the clans in the Eight Banners of Manchuria, and in the process of compiling genealogy, they added the word "Jia" to their horse surnames to form the Majia family, making it difficult for the world to distinguish who is the descendant of Jurchen and who is the descendant of the Han people in the Central Plains.