Where can I open the social insurance file filing letter?

Where are you going to work, go to the file receiving office entrusted by the company in that place (usually social security center, talent flow center, etc.) As long as you can receive and manage files) to handle letter transmission.

If you have a company, then the company will forward the letter to you (regular company). You just need to take the transfer letter, take it out of the original archives, and then take the archives back to your current company. Never open a file out of curiosity! ! !

In that case, you don't have to write it yourself. The transfer letter is a small piece of paper, stamped with the official seal of your file receiving office! !