1. Danxia landform is a kind of landform with steep slope, which is developed from red beds dominated by continental (possibly including non-continental interlayer). At present, this definition is accepted by most scholars, and it can also be expressed as "red bed landform characterized by steep cliffs"

2. Danxia landform is widely distributed in China. At present, 1005 Danxia landforms have been identified, which are distributed in 28 provinces (autonomous regions, municipalities directly under the central government and special administrative regions). Among them, Zhuhai and Qidonggou in southern Sichuan belong to young Danxia, Chishui Danxia in Guizhou belongs to young Danxia, Danxia Mountain in Guangdong belongs to mature Danxia, and Longhu Mountain in Jiangxi belongs to old Danxia. The lowest altitude can be formed in the eastern coastal zone, and the highest altitude can appear on the Qinghai-Tibet Plateau above 4000 meters.

3, but relatively concentrated in the southeast, southwest and northwest. Except China, it is distributed in Central Europe and Australia, among which China is the most widely distributed. 1928, Feng Jinglan and others named the red strata that constitute Danxia Mountain and the corresponding strata in northern Guangdong as "Danxia Layer". In 1938, Chen first put forward the concept of "Danxia Mountain Terrain". 1939, Chen officially used the taxonomic term "Danxia landform", and the concepts of Danxia stratum and Danxia landform (landform is landform) have been used ever since.

4. The so-called "red bed" in the red bed landform refers to the red rock series deposited from Mesozoic Jurassic to Cenozoic Tertiary, which is generally called "red glutenite". The horizontal tectonic landform refers to the flat highland dominated by shovel-like horizontal or near-horizontal tertiary thick red glutenite, which forms a flat-topped, steep, isolated and prominent tower landform under the comprehensive action of strong erosion, dissolution and gravity collapse.