Hugo from Belgium

Dear,
i live in Thailand whit my wife whit retirement visa,
we like to visit Quanzhou for short time 3 ore 4 nights .
I read that we need 4 days to make it, i life about 550 km from Bangkok , i want to be sure that i have all the papers i need to make it, next line ,which documents that are ?
"Other supporting and supplementary documents may also be needed by the consular officer when necessary."

Friendly greetings
Hugo