The purchase restriction policy, also known as the real estate purchase restriction order, is a restriction on the number of houses purchased by a city household. In 2007, Shanghai did not implement the purchase restriction policy. 20 1 1, 1, 3 1, Shanghai issued the "Eight Articles of the New China", which made it clear that from February 17, each family can only buy a new set of commercial housing, which is the first time that Shanghai has clearly "restricted purchases".