Is xian public bus transportation card used for any bus route?

Well, the card can be used on most city buses, some taxies and all subway lines. And you can enjoy some discounts when using these public transport forms.
Only buses that equip with the distinct card mark on the front door can use the transportation card. Some minibuses cannot accept this card.

You need to purchase the card at several pointed bus companies, including The 2nd, 3rd, 5th, 6th or 8th Company of City Bus Company. :-)