Yumen (Simplified Chinese: 玉门; Traditional Chinese: 玉門; pinyin: Yùmén, situated in western Gansu province in China, is a county-level city of over 100,000 famous for oil production and located on the Silk Road, at 39°50′N 97°34′E. Simplified Chinese characters (Simplified Chinese: ç®ä½å; Traditional Chinese: ç°¡é«å; pinyin: jiÇntÇzì; also called ç®åå/ç°¡åå, jiÇnhuà zì) are one of two standard character sets of printed contemporary Chinese written language. ... Traditional Chinese characters are one of two standard character sets. ... Pinyin (Simplified Chinese: æ±è¯æ¼é³; Traditional Chinese: æ¼¢èªæ¼é³; Pinyin: Hà nyÇ PÄ«nyÄ«n), also known as scheme of the Chinese phonetic alphabet (Simplified Chinese: æ±è¯æ¼é³æ¹æ¡; Traditional Chinese: æ¼¢èªæ¼é³æ¹æ¡; Pinyin: Hà nyÇ PÄ«nyÄ«n fÄngà n), while pin means spell(ing) and yin means sound(s)), is a system of romanization (phonemic notation... Gansu (Simplified Chinese: çè; Traditional Chinese: çè ; Hanyu Pinyin: ; Wade-Giles: Kan-su, Kansu, or Kan-suh) is a province located in the northwest of the Peoples Republic of China. ... A county-level city (县级市 Pinyin: xiànjí shì) is a county-level administrative division of mainland China. ... The Silk Road in the 1st century CE. For other uses, see Silk Road (disambiguation). ...
Hence, the Yumen Pass became one of the two most important passes in the western frontier during that period.
The Yumen Pass served as a tollgate to the western countries and as an important stop for the traveling businessmen.
At that time, the Yumen Pass took on a scene of prosperity, through which the silk was carried westerly, and religion, music, and some plants of the western countries were brought in.