The term "expats working in China" refers to non-Chinese nationals who are legally employed within China and hold valid employment documents, along with a permanent residence permit for foreigners.

Expats participating in social security in China are subject to the same contribution bases and rates as Chinese nationals. Their social security numbers consist of the country or region code of the expat's home country and their valid identification number.

Employers hiring foreigners must register them for social security within 30 days of obtaining their employment permits.

Individuals who have participated in social security in countries that have signed bilateral or multilateral social security agreements with China can apply for exemption from contributing to specified types of insurance for a certain period, upon providing proof of participation from the social security agency of the agreement country.

Expats employed by legally registered work units in China must participate in basic pension insurance, basic medical insurance, work injury insurance, unemployment insurance, and maternity insurance. Both the employer and the employee are required to contribute to these insurance schemes as per regulations.

Expats with overseas employers or who have been dispatched to work at branches or representative offices registered in China must also participate in the aforementioned insurance schemes, with contributions made by both the domestic work units and the employee as per regulations.

If an expat leaves China before reaching the prescribed pension age and applies in writing to terminate their social security relationship, they may receive a lump-sum payment of the balance of their personal social security account.

In the event of an expat's death, the balance of their personal social security account can be inherited in accordance with the law.