Due to the restricted purchase, buying a house now must have social security. The important role of social security: 1, which can be used as an ID card. The social security card can be used as an ID card, which is its identification function. Identity certificate mainly refers to the identity certificate of enjoying public employment service, employment support policy, insurance registration, payment declaration, social insurance relationship transfer, medical expense reimbursement and treatment qualification certification. 2, can be used as a bank card The current social security card is one card and two accounts, which are divided into medical insurance personal accounts and financial accounts. It is equivalent to a dual-purpose card, which is both a social security card and a bank debit card. There are cash deposit and withdrawal, transfer, consumer finance and other services, which are more convenient to use. Thanks to chip technology, the security of the new social security card is also stronger. However, it is only used in China, and the credit function is not supported at present, but cross-bank cash withdrawal in the province is free. 3. Social security card is not equal to "medical insurance card". The first thing to declare is that the social security card is not equal to the "medical insurance card". Social security card is the first to enable medical insurance function, so many people mistakenly think that social security card is medical insurance card. In fact, medical insurance is only one of the many functions carried by social security cards, and matters related to social services in the future can be handled through social security cards. 4. After the social security card that can pay and receive pensions is loaded with financial functions, the human and social departments actively promote its application in business links such as paying social insurance premiums and receiving benefits, and gradually involve various businesses of individual payment and payment, including paying social insurance premiums, receiving pensions and unemployment insurance benefits, and paying medical expenses after immediate settlement.