The population ratio in Tibet is obviously problematic. The proportion of Han population in other provinces is above 50%, except Tibet. Please tell me why.

The main reason is that Han people don't adapt to plateau life. Han people migrate all over the country, but it is not easy for Han people to adapt to the high altitude areas of the Qinghai-Tibet Plateau. In fact, the Han population in Xinjiang is less than 40%, the largest ethnic group in Xinjiang is Uygur, less than 50%, and the second largest ethnic group is Han. The second largest ethnic group in Tibet is the Han nationality, although its population is less than 8% to 9%.