It is not necessarily a bad thing to have more international students at a school. But too many students from one country is not good. For example, at my alma mater PEA, the school prides itself on having a great diversity of students from many countries. But the school only takes one or two handfuls from China every year.
More schools are starting to take less Chinese students in recent years. Many of the top 50 schools will only take 2-3 girls and 2-3 boys.
Many schools do not disclose the number of Chinese students they have on the website. Only the total percentage of international students. Going for interviews and asking the interviewer is one way to find out.