Over the years,many medical practitioners have held different views on the existence or otherwise of the six meridians outline,and this has led to countless debates.The terms'Xiang''realm''meaning'and'spirit'were proposed by academician WANG Yongyan,and now we return to the theory of'Xiang thinking'and explore the six meridians outline on Shanghan Lun at four levels:taking the Xiang,building the realm,understanding the meaning and communicating the spirit.The theory of'Xiang thinking'is used to illustrate the existence of the six meridians outline,the idea is expressed in the image,the mood lifts the spirit.To understand the six meridians outline from the'Xiang thinking'is to return to the tradition,to return to the thinking of the ancients to understand things,to cut into the six meridians outline from the thinking level,to grasp the main idea of the six meridians outline,in order to provide a new way of thinking for the clinic to better grasp the dynamic changes of the disease,to understand the current state of the disease more objectively,and to use the medication more flexibly.