What about social security after going abroad? I intend to return to China in two years. Should personal social security be stopped or continued? What if there is no affiliated unit?

If you are only going out for two years, I suggest you postpone the payment first. I'll hand it in when I get home. There is no problem in suspending payment. As long as you have accumulated payment 15 years, you can get a pension when you are old.

If you want to continue to pay the fees, it's not impossible, but you need to find an affiliated company and bear all the expenses yourself, instead of the company helping you bear part of it, as you did in the company before. You can also find a social security agency to renew your insurance.

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