May I know how to get to from Xian See Tang Hostel from airport at about midnight?

You can take shuttle bus Xishaomen line to get to Airport Business Hotel first. The operating hours of this line are from 06:00 to the last flight arrival with the frequency of around 20 mins. It takes around an hour. And the ticket fare is CNY 25 per person. After that, take a taxi to get to the destination. The cab fare is about CNY 20 at that time.

Thank you!

hi..i am staying around that area near south gate..can i use Airport → XA Railway Station
last bus 1am..my flight after 12am too...

Of course. If you can catch the 1:00am schedule, take it to the railway station and take a taxi to your hotel. If you miss it, take the shuttle bus Xishaomen Line to the terminal and change to a taxi. The bus line won't stop operating until the arrival of the last flight.