Hi, is it possible if going to terracotta using subway from anyuan gate directly to terracotta?

Oops, I'm afraid not. Subway has not led to the museum yet. Then I suggest you take a taxi to Xian Railway Station for the fare of CNY9. At the east square of the rail station, find Tourist Bus Line 5 (no. 306)(CNY7), 914 (CNY6) or 915 (CNY6). Any of them can take you directly to the museum. After getting off, you can walk to the Ticketing Window within 5-8min. Just follow the people flow.