In Tang dynasty period, the county of Xinning was renamed to Changning (the present name) in 742 AD.

The city of Changing has an area of 2,046.6 square kilometers, accounting for 0.97% of Hunan and 13.37% of Hengyang.

Exposed in different geological periods from the Paleozoic to the Cenozoic, the distribution of igneous rocks is relatively small.

There are dozens of rock bodies exposed, covering an area of about 428 square kilometers, mainly granite, accompanied by moderately acidic granodiorite and a small amount of basic lamprophyre, basaltic rock and so on.

[6] The topography of Changning is low in the south and high in the north, it is roughly a two-step staircase.

Between the two mountains is the Mianqian - Xihu Low Flat Valley (庙前-西湖低平谷地), which is the traffic channel between Changning and Guiyang.

[7] The water system of Changning City is complete and the river network is dense.

The natural water quality from the Xiang section and its tributaries such as rivers of Yi, Tan, Wu and Chongling, etc.

Due to the influence of the large-scale climate in the region and the complex topography of the territory, annual meteorological elements such as precipitation, air temperature and sunshine are erratic.