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I have read the discussions on the Sanjiao (Triple Burner) by the *Nan Jing* (Classic of Difficult Issues), Wang Shuhe, Qixuanzi, and other great sages, all of whom stated that it is "named but formless." I also read in the *Ling Shu Jing* (Spiritual Pivot): "Those with dense skin texture and thick skin have a thick Sanjiao; those with coarse skin texture and thin skin have a thin Sanjiao. The brave have horizontal Sanjiao textures; the timid have vertical Sanjiao textures." This seems to imply that it has form. Later, observing Li Shicai (Li Zhongzi, Ming Dynasty physician) stating: "Between the muscles and the Zang-Fu organs lies the Sanjiao," which also suggests it is formless. However, Li Shicai considered the "formless" view erroneous and cited the descriptions of thickness and orientation from the *Ling Shu Jing*, as well as the metaphors of mist, foam, and ditch, to demonstrate its form. Thus, does the Sanjiao ultimately have form or not? I respectfully add a few words to clarify this. The Sanjiao refers to the three empty spaces within the chest, diaphragm, and abdomen. When the great sages said it is "named but formless," they intended to distinguish it from other Zang and Fu organs that possess specific, independent forms. They did not mean that without form there is no location; rather, precisely because it points to these empty spaces, it is called formless. The "thickness and orientation" mentioned in the *Ling Shu Jing* refer to the interior conditions of the cavities of the chest, diaphragm, and abdomen, implying that it does not possess an additional, distinct physical shape characterized by thickness or orientation. The Classics further state: "The Upper Jiao is like mist, the Middle Jiao like foam, and the Lower Jiao like a ditch," while some interpretations describe the Middle Jiao as like dripping liquid. These are likely metaphors for the water vapor and fluids within the empty spaces of the chest, diaphragm, and abdomen. If the Sanjiao had a fixed physical form, then mist is gathered Qi that dissipates at times; foam consists of water bubbles that rise and fall; dripping liquid is residual drops that may or may not exist. All lack constant form, so how can they be compared to the Upper and Middle Jiao? As for the Lower Jiao being like a ditch, this merely uses the water channels in ditches to metaphorically represent the water-draining function of the Lower Jiao, not comparing it to the physical shell of a ditch. Regarding Li Shicai's statement that "between the muscles and the Zang-Fu organs," although there is a location, there is originally no specific form. Why then consider "formless" to be an error? Does his logic imply that if a location exists, it cannot be called formless? However, "location" and "form" are different. The reason the *Nei Jing* speaks of its existence is due to its location; the reason the sages concluded it is formless is due to the lack of specific physical structure. The words of the ancient sages and later scholars appear different but share the same essence. Only Chen Wuzhuo (Chen Yan, Song Dynasty physician) claimed it has form, resembling fatty membranes. I suspect this view is not entirely appropriate. Fatty membranes are pre-existing physical substances in the body. If the form of the Sanjiao were like fatty membranes, it would imply another layer of hypothetical membrane. How could one distinguish between a hypothetical fatty membrane and a real one? Therefore, I dare to say this view is inappropriate.