As a famous figure in the late Qing Dynasty, Kang Youwei was selected as a junior high school history textbook early. He advocated learning advanced western technology to make up for the shortcomings of the Qing dynasty, and promoted the Reform Movement of 1898 with Liang Qichao and others in an attempt to save the stormy Qing dynasty. In the history books, Kang Youwei has a positive evaluation, but people who know that history will think that he is dishonest. After the failure of the Reform Movement of 1898, he fled overseas, cheated himself by forging a "belt imperial edict" to buy an island in Sweden, and built a mansion on the island, thinking of spending his old age there. If you look at Kang Youwei's works, you will find that this man had many ideas in the feudal Qing Dynasty, but most of them were unrealistic and even imaginary. After being exiled, Kang Youwei traveled to Japan, India and Europe. During his stay in India, he wrote a book "Datong", in which he talked about his imaginary ideal country, which mentioned the "national transformation plan", similar to Hitler's "national improvement". Hitler was eager to create a pure Aryan race, but Kang Youwei's idea was "hybridization". Based on his years of experience in dealing with foreigners, he came to the conclusion that the yellow race is inferior, which is a complete denial of his ancestors. He advocated that the Qing Dynasty introduced a large number of whites, encouraged men to have children with western women, and women married western men to change their skin color to make themselves stronger. He planned to make all the people in the Qing Dynasty white within one hundred years. In the book, he also mentioned brown people and black people, saying that brown people in Southeast Asia moved them to cold or coastal areas such as the Arctic and Siberia and changed their eating habits. In about 200 years, they will become yellow, 100 years later, they will become white. As for blacks, Kang Youwei estimates that it will take a thousand years to become white, and during this time, they will be kept in the Arctic with less sunshine. In Kang Youwei's world, everyone is white with yellow hair and blue eyes. Today, his ideas are surprising, even Hitler candidly admit defeat, not to mention the reformists such as Liang Qichao who were shocked at that time. Kang Youwei's ideas in Datong Book are simple and clear. He thinks that as long as he looks the same and the world is the same, there will be no war.