The title of "Longmen Twenty Sales" began in Qing Dynasty. The so-called "Longmen Twenty Pin" refers to the inscriptions of 20 statues selected from Longmen Grottoes in Central and Northern Wei Dynasty, of which 19 are in Guyang Cave and one is in Cixiang Cave. "Longmen Twenty Products" is the quintessence of calligraphy art in the Northern Wei Dynasty. The calligraphy art it represents evolved on the basis of the official script of Han and Jin Dynasties. The font is dignified and generous, rich and simple, with official script style and regular script factors. It is the representative of "Weibei" style and occupies a very high position in the history of calligraphy art development in China.
There is also a scenic spot in Yunnan called Longmen Grottoes, but it is far less famous than Luoyang. It is located in Kunming Xishan Scenic Area, starting from Sanqing Pavilion in the north and reaching Datian Pavilion in the south. It is the largest and most exquisite Taoist grottoes in Yunnan. "Longmen Scenic Area" is characterized by "strangeness, strangeness, danger and seclusion", ranking first among many scenic spots in the western hills of Kunming. Visitors to Kunming should go and see it. Therefore, there is a saying that "I don't want to play Xishan, I don't want to go to Kunming, I don't want to go to Longmen, I just want to go to Xishan in vain".