This museum is in my opinion the best thing in Urumqi. Go early in your trip and what you see elsewhere will fall into place better when you see it.
Downstairs is all about the minority cultures. Worth looking around, as you will mingle with (some of) them on the rest your trip. As one reviewer said, maybe a little slanted to the Chinese view of their minorities, but good nevertheless.
The gem is upstairs. The excavations, the mummies, the ancient history. A real eye opener. And if you go to Astana Tombs in Turpan later to see mummies in situ, the museum will explain the context far better than is done there.
The museum is well explained in writing, but the English speaking museum guides are excellent and add more (and answer questions).
A must when you arrive in Xinjiang
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.