Search the library catalogue Access-it for books on Ancient China.
Decide on your search terms.
You could try Ancient China, China - Civilisation, China - History or China - Social life and customs.
Or you could try more specific terms, for example, Great Wall of China, Confucius, Emperor Qin Shi Huang or Terracotta Warriors.
Most of the books about Ancient China are in the 931 section of the Non-fiction shelves.
Also check the general books on Ancient Civilisations at 930 using the contents pages and index to guide you to information about China.
Ancient China by 
The Life and Times of Confucius by 
Emperor Qin's Terra Cotta Army by 
Exploring History China by
You will need a username and password from The Resource Centre to access these resources.
Search Britannica Online Encyclopedia for information on Ancient China
Use the World History in Context Database using your search terms.