In the study of metaphor theory in traditional Chinese medicine（ TCM）

this paper found that there is a metaphorical phenomenon of the duality of "Xiang-conceptual metaphor"

which has not been mentioned before.Based on the research and analysis of the relevant corpus of The Classic of Difficult Issues（ 《难经》） and the research results of modern scholars

this paper demonstrated the duality of"Xiang-conceptual metaphor"from the happening of"fire"and observes the existence and function of this phenomenon from four different aspects of the duality of"Xiangconceptual metaphor"with the metaphorical method of "relieving lung for diuresis"of TCM. It is also believed that the study of metaphor cognition of TCM should not be restricted within metaphor conception. Instead

original thinking method and medium with distinctive Chinese features should be developed for the innovation of theories of metaphor cognition.