Dear Haiheng,
This is Abby from Top China Travel. Thank you for paying attention to our website. We noted that you'd like to rent a car for Xian to Huashan and Luoyang. We suggest to take high speed train between Luoyang and Xian, since the price for car renting will be really expensive, but for the train, around ¥174.5, takes around 1h 40m. And for Xian to Huashan, and transportation in Luoyang, you could consider renting a car. You can consider booking a tailor-made tour on Top China Travel and we will arrange for you. Please let me know if you make a decision.
Any further request or question, please feel free to contact with us.
Have a good day!
Best regards,
Abby