If you want to check the onshore (that is, mainland) RMB exchange rate, you can go to the most authoritative online "China Bank Global Foreign Exchange Quotation" -/SourceDB/WHPJ/. History points to the "past foreign exchange market" in the upper right corner.

But if you want to check the offshore RMB exchange rate, you can search "Google Finance Hong Kong" on the Internet and click on his foreign exchange section. The exchange rate is the offshore RMB exchange rate.

I hope I can help you.