Taxi service from Guangzhou to Hong Kong

No taxi there. But you can rent a luxury car, it would cost about CNY2,000. You can try to search for "Eternal East Limo "online for the caror van reservation.

Or you can take a train from GZ East to HK directly, which saves you much money.
Walk from your hotel to Yuexiu Park Station, take subway line 2 to Gong Yuan Qian, transfer to subway line 1 to the east railway station, and then take train to Hung Hom. Then you are already in the central area.

Thank you for your reply Abel!

We will have heavy luggage, so taking the train has too many stairs and transfers.
Also the taxi is quite expensive!

I think we will prefer to take a long distance bus. I think it starts from China Hotel.
Do you know if I should purchase the tickets in advance? Or i can easily get tickets there at the ticket counter?

No need to book the ticket in advance for the long-distance buses. Just buy the ticket on the spot and you can certainly get a seat. Don't worry!