Personally, I think the temperature difference in Qinghai is large in the morning and evening. I suggest you take long-sleeved trousers, and it is best to take medicine for diarrhea and cold, because the altitude here is high. If you have diarrhea or catch a cold, altitude sickness will be very serious. If you have altitude sickness in Xining, I suggest you go to the local drugstore to buy some rhodiola and soak it in water. Even if there is no altitude sickness, you can drink it for prevention and treatment. Qinghai is also a dry climate, so you can wear lipstick to prevent chapped lips. Take sun protection measures, the ultraviolet rays are very strong here. By the way, you must drink more water. In fact, the altitude in Xining is not particularly high, and the climate is OK. As long as the constitution is not too bad, there is no problem. Welcome to travel in Qinghai. Qinghai Lake is so beautiful! Don't be too tired for the first three days, pay attention to sleep.