From Longhua subway station to Shenzhen Huazhong University of Science and Technology, you can walk or take the bus according to the following steps:

1. Get out of Longhua subway station and walk about 800 meters to Longhua District Government Station (that is, Tianan Digital City Bus Station).

2. Take a bus at Longhua District Government Station, and take bus M578 or M500 to Shenzhen Huazhong University of Science and Technology Station.

3. Get off at Shenzhen Huazhong University of Science and Technology Station and walk about 200 meters to Huazhong University of Science and Technology.

Please note that the above information may change according to the specific time and traffic conditions. It is recommended that you check the operating hours of bus timetable and subway in advance to ensure a smooth arrival at your destination.