I plan to stay at ibis hotel hepingmen, Xi'an, how can I go to the nearest subway station. Is it far?

As I know, the nearest subway station should be Yongningmen Station, which is around 3km from your hotel, so you can take a taxi to reach by spending within CNY10. Taxi is highly recommended for you.
If you want to take local public bu, you can walk from your hotel to Huaxia Bank Station to take bus no. 14, 40 or 704 to Nanmen Stop and then walk to the MTR Station.