Among the increasing inquiries into the relation of"interality"with various disciplines,interality and rhetoric have rarely been connected directly.This essay attempts to examine interality in rhetorical figures by focusing on how interality works in metaphor under the two criteria of openness and negotiation so as to establish an interality hierarchy.This assumed metaphor interality hierarchy is justified as Form 3(vehicle present,tenor implied)>Form 2(tenor present,vehicle implied)>Form 1(tenor and vehicle both present).By applying this interality hierarchy to analyzing metaphors in the imaginative classic of Chuang Tzu,we find that its rich metaphors in all three forms are well weaved to generate appropriate interality,leaving readers in the adequate and comfortable space of poetry and eloquence.This research is expected not only to theorize the specific nature and function of interality in metaphor,but offer implications for exploring interality in other rhetorical figures as well.