Yes 1. Quarrying theorists believe that the main purpose of digging Longyou Grottoes is to quarry stones. But the objection came: "If you want to quarry, why not open-pit mining, but underground mining?" Moreover, opening a small hole from the top and then mining vertically downward increases the trouble and difficulty for no reason. Why not open your mouth a little wider? Why do you want to use the top excavation method, which is much more complicated and difficult than the flat hole excavation method and the bottom excavation method? It is no accident that the 24 grottoes in Fenghuang Mountain are adjacent to each other, dependent on each other from top to bottom, relatively independent and very similar underground. So quarrying is derived from the theory that quarrying is not the only purpose. Critics believe that the main purpose of excavating Longyou Grottoes is quarrying, but the space obtained has other uses, which is mentioned in detail in the scam of Longyou Grottoes.

2. Cave theorists believe that Longyou Grottoes were dug by the ancients for cave dwelling. Commentators based on historical data. Because in Han Yu's Xu Yanwang Temple Inscription and related records, whenever many people are mentioned, it involves the matter of "cutting stones for the room to suppress the king". It is true that Longyou is a place where descendants live together, and cities and counties such as Xu, Jin and Qu are the most common names, but why did their ancestors spend so much money to carve stone chambers and live in groups? The south is far less dry than the north. Is it convenient to live underground? Besides, do they have enough financial resources?

Palace theorists believe that it should be done by an absolute authority for a special need, which can be said to belong to the king, so it is probably the palace of the country. However, as a palace, it is a place where members of the royal family live for a long time. Why are there no royal relics in the palace? As a palace, such a spacious hall should be properly divided and have internal buildings, while the grottoes are empty, with no traces of shelter and internal buildings. What can only the pool explain? The distance between the upper and lower steps of the grottoes is also very large, so it is difficult to transport and enter and exit. Does the king not consider disasters caused by fire, water, earthquakes or other reasons?

4. Mausoleum theory

Critics believe that Longyou Grottoes may be tombs built by ancient wuyue emperors or other princes. Because according to the dome-shaped top of the grottoes, it is very consistent with the characteristics of some underground tombs before the Han Dynasty. However, it cannot be said that there should be tombs, coffins and funerary objects, such as gold, silver, bronze, pottery, porcelain, jade and jewelry, textiles or their fragments, but the grottoes are empty.