all the places of Chimelong Resort are near right?do we need to buy seperate days for each place?

Yes, you are right. Paradise, Safari Park, Water Park and International Circus are near to each other. But one day is difinitely not enough to tour around them. Generally speaking, 3 to 4 days are appropriate to cover them all and fully enjoy them.

And the scenic area sells combo tickets. Safari Park + Paradise Combo Ticket is only valid for one day. Other combo tickets have two days period of validity. So if really staying 3-4 days, separate tickets on different days can be a good idea!