the best way to solve the sub-loans crisis is to prevent housing prices going down . on the one hand,the U.S.Government must soften immigration conditions and relax restrictions in investment for the factory of foreign enterprises,so more people can find work and there may be more people to loan money to buy a house (immigration is one of the main parts).thanks to the increase of demand,the housing prices will stop to go down. On the other hand,other Governments should buy some more room in the United States as far as possible .First,it is precisely at this time to buy high-quality low-priced house of times.And these low-cost houses can be rented or sold to their own country's immigrants. Secondly,all countries in the world should try to help the United States.Because of instability in the U.S. economy will affect all countries in the world.And stability is the foundation of everything.we should not forget that it is precisely because the United States in 1929 of the Great Depression spread to Germany before Adolf Hitler to become German chanceller. When the basic conditions for survival is threatened, then reasonable person(such as Germany)will make the wrong judgement.Therefore,we are help ourselves,to help maintain stability in the world.Now some U.S.states have a high quality borrowers default of the phenomenon.Wall Street and JP Morgen Chase,a senior analyst said:"If the high quality borrowers default to further expand the scale,the consequences will be terrible." Therefore,it is time we take action.