Unfortunately the Spec II update isnt available yet for the Chinese version; hopefully it will when the US version hits. And what do you mean by if the game can be shared?
When you purchase a game off the PSN you can download it 5 times, and with some games they can be shared and put onto your mates PS3.
However with GT5 you can still download it up to 5 times but it will only work with the user ID that purchased it! So even if you download it to your mates console it wont work unless they sign in with your username/password!
I think thats what hes talking about, so the answer is no!
I would personally try and get hold of a Japanese or EU copy.
Not since the Spec II update it cant! Or at least thats what someone else posted on here in the past week.
Seeing as the Chinese version is still Spec I then it probably can, but once it gets updated to Spec II that will all stop (just like the Spec II JPN and EU versions).