According to statistics, the Hakkas living in China are mainly distributed in Hainan, Guangdong, Guangxi, Jiangxi, Fujian, Sichuan, Hunan, Hubei, Guizhou, Taiwan Province and Hong Kong and Macao, with a total population of more than 80 million, accounting for 6% of the Han population. Abroad, Hakkas are mainly distributed in more than 80 countries and regions such as Thailand, Malaysia, Indonesia and Singapore in Southeast Asia, Japan and North Korea in East Asia, the United States, Canada and Brazil in America, and Britain, France, the Netherlands, Belgium, Luxembourg, Germany and Austria in Europe, with more than 6,543,800 people. The styles and forms of Hakka residential buildings have changed in different historical periods and different regions, including Yuan House, Weilong House, Zouma House and Sijiaolou. But the most representative ones are the dragon house and the earth building. Among them, the dragon house is a typical Hakka residential building with Central Plains-Huaxia national characteristics. Hakka Dragon House, North China Central Plains Courtyard, Shaanxi Cave, Guangxi Fence and Yunnan Seal are collectively called the five traditional residential buildings with the most local flavor in China, and are called one of the five characteristics of China residential buildings by Chinese and foreign architectural circles. According to the investigation of historians, this kind of residential building is very similar to the room type of the noble courtyard in the Central Plains, and has its historical origin. Hakka ancestors originally belonged to the Han nationality in the Central Plains, and went south to the mountainous area at the junction of Jiangxi, Guangdong and Fujian due to war and famine. After the Hakka ancestors moved south to settle in Lingnan, they not only spread the advanced farming techniques in the Central Plains, but also maintained the traditional styles of the original buildings and houses.