Yang is a typical multi-ethnic and multi-origin surname, ranking sixth in the current surname list, with a population of about 49.23 million, accounting for about 3.08% of the national population. The contemporary population of Yang has reached 36.96 million, which is the sixth largest surname in China, accounting for about 3. 1% of the national population. According to a new study sponsored by Xinhua News Agency, Beijing, June 5438+ 10, 2006 10 National Natural Science Foundation, the ranking of "100 surnames" has just come out, and Yang still ranks sixth. In the 600 years since the Ming Dynasty, the population of Yang has soared from 2.4 million to 37 million, an increase of more than 15 times. The national population has increased by 13 times. The population growth rate of Yang is higher than that of the whole country. During the period of 1000, the population growth rate of Populus showed an upward trend. At present, the distribution in China is mainly concentrated in Sichuan, Henan and Yunnan provinces, accounting for about 30% of the total poplar population. Secondly, it is distributed in Shandong, Hubei, Hunan, Guizhou and Hebei, and these five provinces are concentrated by 30%. Sichuan is the largest province of contemporary Yang surname 1, accounting for 12.4% of the total population of Yang surname and 4% of the total population of the province. The whole country has formed a high proportion of Yang surname areas north of the Yangtze River, south and east of Inner Mongolia, and a low proportion of Yang surname areas south of the Yangtze River. In Inner Mongolia, Northwest China and Tibet, there are very few people surnamed Yang. The high-rate Yang surname area is bounded by Qinling Mountains and Three Gorges, forming high-density Yang surname areas in Yunnan, Guizhou and Sichuan, and four low-density Yang surname areas in Hubei, Huanghuai, North China and Northeast China. In the past 600 years, the degree and direction of Yang's population movement are quite different from those in the Song, Yuan and Ming Dynasties. The migration from southeast to China and North China has always been greater than that from north to southeast and south, especially to the west and southwest, and to the northeast.