The policy tools of Singapore, Brazil and South Korea to solve the housing problem of urban migrants are all for the whole people and the general public. In other words, the housing accumulation fund system and policies in developed countries have a wide coverage. Whether you are a city citizen or a floating population, as long as you are a citizen of this country, you have the right to enjoy the treatment given by these systems and policies. Singapore's central provident fund system adopts membership system, covering all employed residents, and is a perfect social security system, which covers all citizens. Regardless of age, income and status, you can pay the housing provident fund and enjoy the preferential policies of the housing provident fund system. Moreover, the preferential policies of the housing provident fund system in these countries are inclined to the disadvantaged groups, who can not only enjoy the same housing provident fund treatment as normal citizens, but also enjoy the special preferential policies of housing loans. Brazil's National Housing Bank mainly provides loans to low-and middle-income families, and implements stepped preferential interest rates according to income. The less income, the more concessions. NHF National Housing Fund provides preferential housing loans for first-time buyers and low-income groups.