Cao is one of Chinese surnames, among of in 26.

Cao the source of many in China, mainly include: in the 11th century BC after ji fa g business, the Zhu sealing state (now shandong zou), after being destroyed by chu, or for their sons, or for around him.A written by ji, the 10th the third king wen of zhou Cao Shuzhen priests, by sealing in cao (now the dingtao county in southwest area in shandong province), cao, after laughing, children's for countries.A team from central Asia zhao wu toghuzghuz cao (now uzbek samarkand northeast area).

It is generally believed that the cao surname from ji is the most important source of Cao Shuzhen priests also considered father cao.

In addition to the han nationality, this surname in South Korea as well.

The distribution of contemporary cao

Contemporary cao of the population has reached more than 730, the 27th for the country most popular, accounts for about 0.59% of the population.At present mainly in henan, hebei, sichuan three provinces, about 30% of the national cao total population.Secondly distributed in jiangsu, anhui, shandong, hubei, hunan, five provinces of cao and concentration of 31%.Henan for cao first big province, about 10% of the national cao total population.Across the country to form the ji lu yu su, anhui, sichuan and hunan three cao high density areas.Cao distribution frequency diagram shows that in the crowd in the eastern central and western sichuan, qinghai, gansu hexi corridor region, north central Inner Mongolia, shanxi, shanxi, south west of most of the Beijing and tianjin, hebei, shandong, henan, anhui, hubei, jiangxi, northern cao generally accounts for more than 0.88% in the proportion of the local population, some as high as 2%, this part of the cover area accounts for about 20% of the total land area, about 37% cao crowd.In eastern sichuan, hunan chongqing northern guizhou, yunnan and guangdong north, south, weald, most in southern and northern henan, west hubei, jiangxi, Sue Shanghai eastern zhejiang and fujian, shandong, hebei east, north, southwest most, eastern Inner Mongolia, heilongjiang, liaoning, jilin, cao generally accounts for between a 0.44% and 10.88%, the proportion of the local population coverage area accounts for about 32% of the total land area, living around 53% of the cao.