What should I do if the social security payment has stopped for three years?

You can choose to make up. According to the Notice on Issues Related to Employees' Payment of Basic Old-age Insurance, if the insured fails to pay the old-age insurance premium or the payment is interrupted for various reasons, he can apply for payment within the working age stipulated by the state (male: less than 60 years old, female: less than 50 years old, except those who have received old-age insurance benefits).

Legal objectivity:

People's Republic of China (PRC) Social Insurance Law Article 2 The state establishes social insurance systems such as basic old-age insurance, basic medical insurance, industrial injury insurance, unemployment insurance and maternity insurance to protect citizens' right to get material help from the state and society in the event of old age, illness, industrial injury, unemployment and maternity. People's Republic of China (PRC) Social Insurance Law Article 3 The social insurance system adheres to the principles of wide coverage, basic protection, multi-level and sustainability, and the level of social insurance should be compatible with the level of economic and social development.