I am arriving HKIA at 1 am In transit want to go to Shenzhen Luohu. How to go to metro railways?

It usually takes 30 to 60 minutes to check out upon arrival. So I am afraid that there will be no metro service then. You are advised to stay at the airport, and set out for Luohu the next morning.

Because you have to transfer several times by MTR, you are advised to choose Bus+ MTR mode of transport. Take bus line A43 from Airport (GTC) Station to Sheung Shui Railway Station. Then, change to MTR East Rail Line to Lo Wu Station. The fare totals HKD 54.9, and the trip takes 75 minutes. After crossing the border to Shenzhen, you can see Luohu Station. :)