What if two Nanchang social security companies merge?

At the front desk of Ji 'an Social Security Bureau, you can use your ID card to prove it, affix the official seal of the Social Security Bureau, and then apply for transfer to the front desk of Nanchang Social Security Bureau with the certificate, but generally you can only transfer to a first-class pension.

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