The mid-levels of the Tang and Song Dynasties are curved, the tombs of the Han Dynasty are located at the top of the mountain, while the tombs of the Shang and Zhou Dynasties are located on both sides of the river, which means that the terrain selection of tombs in different periods is different.

The original sentence is: Mid-levels in the Tang Dynasty, curved in the Song Dynasty, with Han tombs at the top, Shang and Zhou dynasties on both sides of the river, and Qin and Han tombs buried in the mountains. The Eastern Han Dynasty and the Southern Dynasties chose the mountainside, and the Sui, Tang and Song Dynasties stood under the corpse slope.

Most of the tombs in the Spring and Autumn Period, Warring States Period and the early Western Han Dynasty were buried at the top of the mountain or near the top of the mountain. Tombs in the middle and late Western Han Dynasty like to be buried on hills, and the terrain is lower than that in the pre-Qin period. Most tombs from the Eastern Han Dynasty to the Wei, Jin, Southern and Northern Dynasties were dug halfway up the mountain. The tombs of Sui, Tang and Song Dynasties are generally buried under the slopes.

These words also reflect the development and progress of Feng Shui theory. In Shang Dynasty, Spring and Autumn Period and Warring States Period, the theory of geomantic omen was not perfect. Many nobles mistakenly thought that the position of the top of the mountain, like the middle of the altar, could control everything and chose the cemetery on the top of the mountain.

This is actually a dragon burial, which does not conform to the theory of Feng Shui. During the Qin and Han Dynasties, drawing lessons from experience, most cemeteries were buried on hillsides or mountains. This is called dragon burial, which is an improvement over the Spring and Autumn Period. The geomantic classic "The First Classic of Fox" may come from Qin and Han Dynasties.

The theory of geomantic omen in Tang Dynasty was more perfect. According to feng shui, the real feng shui cemetery may be the place at the foot of the slope, where four mountains come to Korea, where life gathers and mountains and rivers meet. Later tombs in the Tang, Ming and Qing Dynasties, especially the imperial tombs, all relied on this theory, so it is more reliable to find the location of the big cemetery by this law.