Nouns can he reduplicated, and the range of vocabularies and meaning are very wide. By using the prototype theory, iconicity principles and the de-categorization view of cognitive linguistics to argue and explain some nouns reduplication ’ s cases, it can he found that with the generalization and abstraction of reduplicated noun ’ s meaning, the functions of it has transformed. Those reduplicated nouns which are in deeper of de-categorization and dispersing quickly are not expressing referential meaning any more Jiut descriptive meaning, and those nouns will also shift from noun category to other parts of speech category, as a result, the semantic function will change to modified function or others.