One is the difference in body temperature, and the other is the difference in pH constitution. The third is skin color, and the fourth is physical appearance. Fifth, personality characteristics and expressions are different. Sixth, the diet tastes different. Seventh, different ways of thinking. The south of the Huaihe River in Qinling belongs to the south. The temperature of real northerners is above 36.7 degrees. It belongs to heat syndrome and acidic constitution, and the water source also belongs to weak acidic water source. Strong cold resistance. The temperature of southerners is between 36. 1-36.6 degrees. It belongs to cold constellation and alkaline constitution. The drinking water source is also weakly alkaline. People in China near the Tropic of Cancer have the lowest body temperature. Moreover, southerners have developed hair glands, and many adult men have leg hair and beards, which help to dissipate heat. The skin color of southerners is light yellow, while that of northerners is red and yellow. In terms of height, people in the Central Plains (from Sanguan to Qinling and Huaihe) are actually the tallest. Southerners have wide foreheads. Because there are many lakes and rivers in the south, many areas are coastal, and many of them are descendants of houseboats, so many southerners have long lower limbs, long calves and slender fingers, and people of the same height have relatively thin bones, which is very suitable for swimming. Southerners are cool constellations, quiet and introverted by nature, so they express themselves directly and briefly, and they will be annoyed if they talk too much. Northerners are hot constellations, with warm and generous nature, many euphemistic expressions, love performances and are good at performing arts. So southerners and northerners are together, southerners are listeners, and northerners tell more. Northerners perform talents, while southerners are mostly spectators. Southerners like to eat fresh and sweet food. While northerners like salty food. Southerners are alkaline, so eating more sugar is very helpful to their health. Southerners belong to simple thinking, which is a way of thinking refined after retrieval, so southerners are better at judging and choosing, more intuitive and easier to grasp something. Compared with southerners, northerners are complicated in thinking. Therefore, it is more suitable for doing some exquisite and beautiful careers. He has profound attainments in literature and art. Due to the above differences, it is easy for northerners and southerners to have misunderstandings and frictions when they live together. Therefore, it is best to live with people from one's own ethnic group in this area. This area in Northeast China is very special, and many people come from different nationalities and regions. The aborigines in Northeast China are Manchu, also known as Mohong and Buji. The average height is the shortest in the country. Many people easily confuse Manchu and Hui, which is wrong. The real Hui nationality is of Arabic descent, with low body temperature, black hair, flat eye sockets, stuffy nose, not particularly big, fair skin and strong body. The real Hui people are low-key and calm, which is a kind of retrieval thinking. The soul of Hui people is cool and clear, and the heart is clean. Muslims are not allowed to intermarry with other nationalities, and life will be in conflict. Manchu people have light yellow hair, high body temperature and relatively short stature. There is a nationality of Uighurs who look like the Hui nationality, with the same lifestyle, eating habits and religious beliefs, but the difference is that their eye sockets are deep, their noses are high and their body temperature is higher than that of the Hui nationality. Many people say that most people in Northeast China are descendants of Shandong people, which is wrong. Many generations ago, Shandong people came to Guangdong. Many of the descendants of the remaining Shandong people have returned to Shandong. During the late period of the Cultural Revolution, from 1975 to the early 1980s, due to job transfer and livelihood, many people in Sanguan moved to the northeast to live and build. Formed a modern northeast crowd. In modern times, Mongols, Koreans, Henanese and Manchu are the most common ethnic groups in northeast China, followed by everyone in northern Jiangsu, people in southern Zhejiang, Shandong, Hubei and Hui.