Social insurance refers to a social and economic system that provides income or compensation for people who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons. The "three funds" of social security are the housing accumulation fund, the small enterprise back-pay guarantee fund and the disabled unemployment guarantee fund.

Housing accumulation fund: refers to the long-term housing savings paid by state organs and institutions, state-owned enterprises, urban collective enterprises, foreign-invested enterprises, urban private enterprises and other urban enterprises and institutions, private non-enterprise units, social organizations and their employees.

Housing accumulation fund: Small enterprises have operational difficulties for various reasons, and even face bankruptcy, closure and hidden owners. And employees can also get wages and social insurance premiums. Shanghai issued the Detailed Rules for the Collection and Use of Small Enterprises' Wage Arrears Security Fund, which provided an operational basis for enterprises to pay and apply for advance payment of wage arrears security fund.

Unemployment insurance fund for the disabled: referred to as the disability insurance fund, it is a fund paid by organs, organizations, enterprises, institutions and private non-enterprise units that fail to arrange employment for the disabled according to regulations.