I am Jordanian living is Saudi, my wife who is living with me wants to visit China, what is required

It is impossible to apply China visa through the internet.
If you and your wife live in Madinah, Makkah, Taif or Jeddah, please go to China consulate in Jeddah to apply visa, you can submit visa application in person or entrust someone else to do it for you.

if you live in other places in Saudi Arabia, please go to the below two offices authorized by China embassy in Riyadh to apply China visa:
Chinese Competitive Spirit Co. for Visa Service
Address: Olaya District, 62nd Street, Sada 1 Business Center, Riyadh

Alsandross International Est.
Address: Bin Salem Trading Center, Takhsossi Street, Riyadh (next to the Emirates Airlines Office)