Miao nationality comes from the Three Miao Nationality and is related to Yan Di, Huangdi and Chiyou, while Yan Di, Huangdi and Chiyou are related to the origin of Chinese. Therefore, exploring Miao mythology is helpful to study the origin of Chinese. China's creation myth is the origin myth of China people, and the Three Emperors and Five Emperors are the protagonists of China's creation myth. The myth of ethnic origin is a creation myth about the origin of tribes, and the myth of Miao nationality is the epitome of the myth of ethnic origin of the Chinese nation. Western national theory is in danger of splitting the motherland; Therefore, the author redefines "nation" and introduces a concept, that is, the predecessor of the Chinese nation-Kunlun Sanshi. Yan Di, Huangdi and Chiyou are the representatives and symbols of three families in Kunlun. Sanmiao is the postwar legacy of the three families in Kunlun.