Dear YJ,
Thanks for contacting Top China Travel!
Option 1: Take Subway Line 2 to Sports Park Station and get out of the subway station through Exit C, walk for about 500 meter to City Sports Park Station and hop on Bur Route 游4 to get to Hanyanglin Mausoleum
Option 2: Take Bus Route 723 at the bus station near Xian North Railway Station and get off at Administration Center Station, walk for about 230 meters to Zhangjiabao Stop, and transfer to 游4 to get to Hanyanglin Mausoleum
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