Thanks for your reply.
I paid the app by credit card which bind with my Apple ID.
I also contacted with Apple China about this issue. The staff told me that there was no transaction records yesterday.
But the credit card bank sent me a message about transaction pre-authorization ,then sent me a cancel transaction pre-authorization message. I don't know why.
Then,I bought Enpass again, and I had successfully upgraded to Pro Version this time.
I will contact with U if there is something wrong!