China ancient myths and legends, also known as "carp yue longmen", mean that yue longmen, a carp of the Yellow River, turned into a dragon. Metaphor career success or status promotion. From Xinshisan Ji Qin. The legendary story of fish leaping into Longmen happened in today's Longmen Grottoes in Luoyang. Li Bai's "Gift to Cui": "The Yellow River three-foot carp originally lived in Mengjin, not a dragon, and returned with the fish." The "Jin Meng" in the poem is the county under the jurisdiction of Luoyang today, with the Yellow River in the north.

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According to Yu Gong, "guiding rivers to accumulate stones, as for Longmen". According to "Famous Mountain", "When the river reaches this mountain, the water waves rise and fall, like a mountain boiling". Qing Qianlong's "Hancheng County Records" contains: "There are broken mountains and cliffs on both sides of the strait, which are relatively like doors, but dragons can cross them, so they are called Longmen." According to legend, "Longmen" was carved by Dayu when he was in charge of water control, also known as Yumendu. Regarding "Yu chisels Longmen", Lv Chunqiu said: "Diligent in the world, unremitting day and night, connecting with Dachuan, absolutely blocking, chiseling Longmen."

"Three Stories Meeting" records: "There are two mountain walls here, from which the river flows out, competing for about a hundred steps. The walls on both sides are cut off and shaped like doors, so it is called "Longmen".