When Belgium applied for Schengen visa, the transfer place submitted was different from the actual travel time, okay?

According to your situation, you can transfer from other places.

Because your connecting flight is in Schengen countries, and your next flight is an inland flight, there is no entry and exit formalities, so your first stop in Europe is the entry station. You must go through the entry formalities at the transfer airport, so be sure to prepare some documents for your stay in Belgium, including hotel orders, invitations or admission notices, for inspection. But please rest assured that this will not bring you any trouble. And your Belgian visa doesn't say where you have to enter the country.

There is another problem, that is, your luggage. Your luggage needs to be taken to your connecting airport and then checked on to the next flight. So when starting from China, you can't hang directly from the starting point to the destination in Belgium.

Although I have written so much, walking is actually very simple, so don't worry too much. I am an outbound tourist, and I often take groups around this corner. Don't worry. Hehe, I wish all the best.