Can Kunming University of Science and Technology change majors? When is it usually?

Yes, according to the results of the first semester of freshman year, generally speaking, the top 4% students in the class can do it. In the second semester, I will inform you about changing your major. Then write an application, draw lots, and interview as appropriate. I passed the interview (usually). Basically, it will do. But you can't fail in the second semester, and you can't transfer if you fail.