Reduplication is a one of the creative ways in Mandarin.People usually reduplicate to express more deep lexical meaning or semantic meaning vividly.Reduplication is a process of forming new words by repeating an entire free morpheme(total reduplication)or part of it(partial reduplication).Morphologically,functions of Chinese reduplication may place categorically within the derivational domain of lexemes.In fact,whereas derivation typically forms new lexemes and can be category changing,reduplication often conveys values typically found in the inflectional domain.With using test of categorical word and test of lexical decomposition,this research achieves shed new light on the nominal reduplicative processes.As result,in nominal domain,reduplication gives as a result plural noun.In derivational domain,nominal lexeme in reduplication has flexible distribution of lexical items.