Is there any facility of rest room at baiyun airport?

Yes, there are. The rest room can be found easily by follow the direction boards.

dear hank thanks for the reply
if possible tell me do we get the room easily at the airport or have to book it in advance also tell me charges and check out time thanks

Hi, don't worry! You can get the room upon your arrival. Generally, there is no need to book that in advance.

However, as I know, the rest rooms are provided for passengers with business tickets or first-class tickets or VIP ones. And the fare is a little expensive. I suggest you dail the hotline to know the details: 400-830-0000

I just know the rest rooms operated by Southern Airlines stop service till the arrival of the last flight.