will arrive at Guangzhou pass midnight, how much taxi to beijing lu grand continental service apt (5pax)

Actually, a taxi is allowed to accommodate 4 passengers in total. At that late, try to negociate with the driver. Maybe he or she will take you all. Anyway, the taxi fare for the whole journey can be CNY110-120.

There is another way. Take shuttle bus line 1, which will not stop operating until the arrival of the last flight, to CAAC Ticket Office (near to Railway Station). Upon your getting off there, transfer to one or two taxis to reach your hotel then.

Right, as for the taxi, there is no need to book that in advance. Just flag down and you can catch it.