Going to china for 5 days holiday

Jovena, if you don’t have residence permit, work permit or study permit in Singapore, it may be difficult for you to apply for it from there.
If you have any of the permits, you need to provide those documents: your passport and copy of its data page, the completed application form affixed with a passport-style photo, round trip air tickets and hotel reservation, and your residence permit in Singapore, as well as your financial support proof (if it’s the first time you apply for it).