Which is fast way to arrive from Shenzhen Airport to louhu? Bus, train or taxi

Of course the fastest way is to take the taxi in usual time. It takes 40 to 50 mins on the way.
If you worry about the traffic jam, taking subways in also a good choice. Take airport shuttle bus to get to Hourui Station first. Then take Subway Luobao line to arrive at Luohu Station, Exit A. The duration is about 70 mins.