This article will use "Humanistic Geography", which emphasizes the interpretation of history, as the basic method for further discussion of the placeness of Da-hu. Or, to put it another way, will interpret the "Local Characteristics" of Da-hu, which lies east of "Yi-Hsien", 「隘線」 deep in the "Yi-Ken District"「隘墾區」 of the inner mountains, in terms of local culture and historical development. This article will start with the frontier characteristics of Da-hu, its ecological environment and its former identity as a camphor forest. The "frontier characteristics" discussed in this article are based on descriptions in ancient Chinese texts which report a fear of the Da-hu "border", the negative evaluation of Da-hu from the standpoint of Feng-Shui theory and the argument that the "frontier" should belong to Atayal tribe; not the "Yang-Jan Pu-Di"「養贍埔地」of the Hou Long committee 「後?社」 and the Hsin Gang committee 「新港社」 of the Ping-Pu tribe.（平埔族） Drawing upon ancient Chinese texts & modern scholastic viewpoints, this article will then discuss Da-hu's basic terrain, climate and ecology in order to explain why this area was originally a camphor forest. In line with the above theories, this article will point out that the Chinese land developers used private force to invade Da-hu in search of the vast profit to be obtained from camphor trees. But fierce & bloody conflict with the Atayal tribe was inevitable. The Chinese land developers therefore united with the Ching Dynasty national military forces to conquer the Atayal tribe and successfully complete their invasion of their land. It is therefore the conclusion of this study that the formation of Da-hu placeness was only fully completed after the Chinese, in their pursuit of profit from natural resources, invaded the region and subdued the Atayal tribe through armed force.