What do you mean? China invest heavily in Xinjiang. Xinjiang GDP is 19th on the list https://zh.m.wikipedia.org/wiki/%E4%B8%AD%E5%8D%8E%E4%BA%BA%...

Per capita GDP is similarly ranked.

And there are 56 minorities groups in China, they were all have specific aid program, like preferential treatment in national college exams.

What's the basis of such a wishwash statement on China and the people? Are you suggesting Chinese people are practicing racial segregation? Or what exactly are you suggesting?