The patent refers to the field of ' buildings for public purposes' . A fourth-generation ecological architectural model using ethnic patterns is provided, which reflects excellent ideologies at all times and all over the world and integrates the fields of science, logic, philosophy, sculpture and art. The architectural model is both idealistic and materialistic and also multidisciplinary and multifunctional. The architectural model can save the investment of city sculptures by one billion RMB and increase the revenue of tourism industry up to 30percent of the total GDP, and has no use of national finance. The architectural model involves 300 libraries, 5 bridges and 11 buildings. It is estimated that the investment is 10 billions, the revenue is 10 billions per year, and the construction profit is one billion. The architectural model aims to enable 800 million farmers to be their own master, build a larger city community with 30 million populations and 0.1 billion foreign immigrants, and solves ' three rural problems' . The architectural model helps to increase the production revenues by billions, promote the tourism industry, build a ' harmonious society' , improve the relationship between neighboring countries, strengthen the military power, save sources, improve the life quality of common people, and create a peaceful community.