what is your nationality?应该回答china还是chinese???应该是chinese 但为什么？请注明理由，

中国只有一个，中国人有无数个，我们是千千万万个中国人中的一个，所以用chinese.再说一个人做么能用国家名字来代表呢
虽然有点牵强，望采纳！

回答Chinese
nationality是国籍的意思
21世纪英汉汉英双向词典：
例子：of Italian ~ 义大利籍的
I am British by ~. 我的国籍是英国
"What is his ~ ?"-"He's Chinese.". “他是哪一国人?”“他是中国人”

剑桥高级学习词典： nationality noun
1 [C or U] the official right to belong to a particular country:
She has British nationality.
What nationality are you?
2 [C] a group of people of the same race, religion, traditions, etc:
At the International School they have pupils of 46 different nationalities.