What is the most convenient way from Tangshan (or Beijing and Tianjin) to Jiayuguan Great Wall, Crescent Spring, Mingsha Mountain, Mogao Grottoes and Jiuquan Satellite Launch Center?

I suggest going directly to Jiuquan. (Jiayuguan Great Wall Crescent Spring Mingsha Mountain Mogao Grottoes, these are all Dunhuang, Dunhuang City is in Jiuquan. After arriving in Jiuquan, there is a special tourist bus to Dunhuang. )

1 It's the most convenient to go directly to Jiuquan without changing trains.

If you leave from Beijing, it will take 32 hours by K43. Take the Beijing-Baolan Line.

If you consider changing trains from Lanzhou or Xi, you can take many buses. There are many schemes on the Internet.

When you arrive in Jiuquan, you can consider going to the launch center or Dunhuang first. The launch center can also go last.