What is the easiest & fastest route to go from Beijing Airport to Loong Palace Hotel, Changping?

If you refer to the Capital Airport, then you are suggested take Shuttle Bus line 8 and get off at Huilongguan(Longze), which is only 5 km from your hotel, so you can take a taxi there. The shuttle takes CNY30 and about 1 hour, the taxi takes about 15 minutes and CNY20-30.