I am going to leave Dalian for Dunhuang in March and April, and the journey takes about 15 days. I don't know how to arrange the lines.

From Dalian to Xi 'an, get off the train and stay in Xi 'an for two or three days, visit the Terracotta Warriors, Huaqing Pool, Wild Goose Pagoda, City Wall, Huashan and other scenic spots, then take the train to Lanzhou, visit the Yellow River customs line in Lanzhou, then take the train to Jiayuguan in the evening, visit the towers and take a bus to Dunhuang. Spend two days visiting the Mogao Grottoes in Dunhuang, Yueya Spring in Mingsha Mountain, Yumenguan and Ya Dan Ghost Town, then take the train from Liuyuan Station in Dunhuang to Urumqi, and visit Tianchi and Turpan in Tianshan Mountain for one day. Finally, take the train from Urumqi to Dalian.