I would like to know if there is a bus from Hushan to the terracotta army ?

There is no direct bus between the two places. The best way is to take a high speed train back to Xian North Station and you can take a free shuttle bus to Terracotta Army according to your high speed train ticket. The high speed train ticket fare is about CNY 55 and it takes about 2 hours of the whole journey.

Thank you very much for your answer.
Is the free shuttle located close to the train station ? How can I recognize it ?
As we will be a group of 4, the taxi may be an option ? (from Huashan to terracota Army). Do you have an idea of the price ? (one way) ?

thank you,

You can purchase tickets of Terracotta Army in the North Station (located south of the entrance to Metro Line 2 of the negative first floor of the North Railway Station). Then on the basis of the ticket of the high-speed rail (train ticket) of that day, you can get bus tickets for free.
It’s hard to take a taxi for such a long distance, but you can hire a private car, the fare is CNY 300 to 350.