Benedict Anderson's theory of "imagined community" represents the western national-constructivism,which emphasizes the significance of cultural awareness in constructing the nationalism.Mainstream American literature roots in European culture,with a sense of superiority of whiteness.The works of American ethnic writers,especially the colored races,are at the marginal position of the American literature.They are erased and silent.Moreover,American literary critics regard their works as alien ones,or as "others".Against this background,American ethnic writers struggle to make their voices heard and to quest for their deserved identity.This thesis will explore the functions of the narrative "storytelling",in finding the voices for African-American writers,Asian-American writers and Indian American writers,the functions of the stories in constructing their voices and identity and further analyze the heterogeneous isomorphism of three ethnic works in constructing their nationalism.