Hello...

You can choose the 3 days admission ticket which is For all visitors, Valid for any three days except Peak Days and One ticket per person, valid for one entry per day.

If you have anymore enquires,

come visit this website:

http://yeschinatour.com/china-guides/chinese-culture/world-expo-2010-shanghai/ 

there are some FAQ avaliable

Regards

Yes!Chinatour