Ticket for Jiuzhaigou

According to the policy, the ticket is only valid for one day and if you want to go there again, you still need to buy another ticket from April 1 to November 15. For other time, you can enjoy the re-entry policy, but you do some other procedures.
For the sightseeing buses in the valley, you need to pay on the second entry at any time.
These are all I know and hope it helps.