Jang in the region of the highest population density per unit area in hunan, the most neighboring, jang population reached more than 1.3 people per square kilometer, central region can reach more than 3.9 people.Jang distribution density diagram shows that the highest density of (more than 1.3 people per square km) area 11.6% of the total land area, jang population about 2.87 million;0.65 1.3 people per square km area 21.4% of the total land area, jang population 1.88 million;Less than 0.65 people per square km area 67% of the total land area, jang a population of 1.48 million.

Jang distribution is very wide, but unevenly.Jang distribution frequency diagram shows that in the crowd jang in the south of the Yangtze river is a common surname.In most of sichuan and yunnan, guizhou, guangxi, hainan, guangdong, hunan, jiangxi, shaanxi, ningxia, western, most of jiangsu and zhejiang, anhui, xinjiang east southeast northwest, jang generally accounts for the highest percentage of the population, in o. by more than 54%, especially in the central region, the proportion can reach more than 1.6%, covers about 20.7% of the total area of the country;In yunnan, southwest of middle eastern, western sichuan, qinghai, gansu, shaanxi, southern hubei, jiangxi most, most of northern central guangdong, fujian, anhui, jiangsu, heilongjiang in the northeast, north jang accounted for the proportion of the population is in commonly 0.54%, 0.27% coverage area accounts for 19.6% of the total land area;In other parts of the jang generally accounted for less than 0.27% of the population, the covering area of about 59.7% of the total area of the country, of which less than o. 1% of the area covered by about 35%.