Hi, we will be going to Hainan tao this December. Does my maid Indonesian need to apply visa?

Yes, Indonesian passport holders need a visa to visit China.

Hi, I received your answer and thank you. If I would want to go embassy to do visa for my maid, what documentation to bring and where to go and what will the charge be? thanks

The visa issue in Singapore is handled by the CVASC on behalf of the embassy. Add: 22 Malacca Street, #09-00 Royal Brothers Building.
The requiremetns include: your maid's valid passport, Singapore resident permit, visa application form V2011A and V2011B, passport photo, round-trip air ticket and hotel reservation.
The visa fee is SGD 50 (single-entry visa fee) + SGD 25 (tax inclusive) (regular service fee for the CVASC).