This is the Chinese version of Cortana:
Is there any way I can enable it? Changing my phone to Chinese doesn't work.
Windows Phone Stack Exchange is a question and answer site for enthusiasts and power users of Windows Phone OS. It only takes a minute to sign up.Sign up to join this community
Cortana is available in China. But the language must be set to Chinese (simplified) or 中文 (简体). Bing translate indiactes that you have set the language to China (People's Republic of China) or 中国（中华人民共和国） which is not supported by Cortana. In case you want to know Chinese (simplified) is located next to China (People's Republic of China).
So go to Settings -> Language and choose 中文 (简体).
Now Cortana should work for you.
Reference : Microsoft.com - Cortana's availablity