A person can pay two copies of social security in different places.

You can buy two social security at the same time in different places, but you can't get two pensions in the future. Social security is a system in which the state establishes a social insurance fund through legislation to provide necessary material assistance to workers who participate in labor relations when they lose their ability to work or are unemployed. Social security is not for profit. Article 2 of People's Republic of China (PRC) Social Insurance Law Article 4 of People's Republic of China (PRC) Social Insurance Law

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 4 Employers and individuals in People's Republic of China (PRC) pay social insurance premiums according to law, and have the right to inquire about payment records and personal rights and interests records, and require social insurance agencies to provide social insurance consultation and other related services. Individuals enjoy social insurance benefits according to law and have the right to supervise the payment of their own units.