Height is determined by many factors, including genes, climatic conditions and daily diet. Genes determine the upper limit of growth and development, but whether the upper limit can be reached is determined by living conditions. With regard to the distribution of human height, the famous anthropologist Roginski and others drew from a large number of anthropometric data: "The average height of the whole human being is about 165cm for males and 154cm for females, and the average difference between male and female height is 8 ~ 1 1cm." There is also: "Short stature (less than 160cm) is the characteristic of people in the northernmost part of Europe, Asia and America (Littles, Mansi, Handi, Ancient Asians and Eskimos), and many groups in East and Southeast Asia (Japanese, Indians, Indonesians) and Central and South America are also short stature. Tall people (above 170cm) are also found in northern Europe (Norwegians, Swedes), the Balkans, the Caucasus, northwestern India and North America. " Obviously, in anthropology, different races have their own characteristics, and different races have different heights. The highest race is black, Europa and their variants, while Asians are of medium height. The height of a nation is formed by differences in geography and climate. Since the Neolithic Age, due to the continuous migration of population and mixed blood, the geographical characteristics of human height began to blur. Migration leads to the same morphological characteristics of ethnic groups, and the result of mixed blood is the emergence of various varieties. For example, the Ethiopian race is the highest in Africa. Although the skin color of this race is black, it contains red components, which makes it reddish brown. According to textual research, this is a special race on the African continent. Anthropologists pointed out: "Ethiopians live in Ethiopia and Somalia in the northeast of Africa and the Horn of Africa. They are a mixed type of Europeans and blacks, that is, whites and blacks." The influence of climate on height is due to the difference of "environment", and "temperature" is the most prominent factor of "environment". No matter in Europe or East Asia, there is a trend that the average height increases with latitude from south to north. For example, the height trend of Europa race is Nordic >; East and west Europe > southern Europe > Arab region. South American Indians and Africans in the southern hemisphere have opposite physical characteristics. The farther south the equator is, the higher the average height is. The correlation analysis made by Stinson (1990) shows that temperature, humidity and rainfall are negatively correlated with body size (height and weight), while sunshine and annual maximum temperature are positively correlated with body size. In other words, the more people live in warm and humid areas, the lower their physical fitness; The more people who live in areas with cold, large annual temperature difference and abundant sunshine, the higher their physique. Zoology has the same proof. For example, the study of tigers shows that "different geographical populations need to cope with different climatic conditions and other conditions, and they often show some adaptability differences." "Tigers in China, which used to be distributed continuously, have now been divided into two subspecies: North Tiger and South Tiger. The northern tiger is mainly distributed in the northeast, and is occasionally found in Liudaomu. It's big and marked. South Tiger is mainly distributed in South China, with small size and light markings. At least part of the variation of expression in different regions and different populations is adaptive. As far as warm-blooded animals are concerned, individuals distributed at high latitudes tend to be larger, while individuals distributed at low latitudes tend to be smaller, which has adaptive significance. The surface area of an individual is increased by one square, and the volume is increased by one cubic. That is to say, the ratio of area to volume decreases with the increase of animal body. In this way, warm-blooded animals distributed in cold areas can relatively reduce body heat loss when they are large, which is conducive to survival. " Animals are like this, so are humans. Why the northern race is higher than the southern race has been reasonably explained here. Because only tall people can keep warm and live, which is also the reason why Europa people are tall and white, with light eyes and fur. People in cold areas can only keep their body temperature by increasing their volume, and only white skin and light color can absorb sunlight.