What should I do with all the medical insurance and social security I paid in China and then live in Taiwan?

If it is determined that the immigrant will not come back, you can go through the surrender procedures. If you don't immigrate, you will just live there for your retirement. If you have paid for 15 years (medical insurance also meets the retirement age in your place of residence), you should go through the retirement procedures at the retirement age. The money will still be transferred to your retirement account. You can also withdraw it in Taiwan, and there will be a handling fee. Of course, you have to ask the Medical Insurance Bureau about medical expenses. How to reimburse?