What is the personal social security number of Guangdong?

The personal number is actually the "endowment insurance computer number". I couldn't type that personal number at first, but then there was an "endowment insurance computer number" on the "Examination Form of Guangzhou Endowment Insurance Insured Persons as Payment Years", and it was all right.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.