Whenever you legally work in China, after a certain amount of time (don't remember the details) and regardless of your citizenship, you will receive a fixed amount of money when you retire, according to the amount of time you worked and your salary. Interesting thing is, foreigners can apply to get their money anytime they want when they stop working, not sure if that applies for Chinese citizens. Their is also a "housing" fund supposed to help for paying your mortgage or rent, paid by the employer.
All this is managed by the government but you can improve it using private retirement plans and insurances, however employers cannot (shouldn't) be allowed to not sponsor the government one.
It is in some ways similar to some Western European countries, like France, where you are supposed to get money from the government once you have worked a certain amount of time and you decide to retire. I guess it differs a lot in the execution though.
Beware, France retirement is getting frail. Not at all like a $0 as in the US, but many elders have tiny jobs to compensate for a lower than expected sum.
It is in some ways similar to some Western European countries, like France, where you are supposed to get money from the government once you have worked a certain amount of time and you decide to retire. I guess it differs a lot in the execution though.