Guang'anmen was originally called Guangningmen during the Ming and early Qing dynasties. The name change came courtesy of a Chinese tradition that even emperors could not ignore. When the Daoguang Emperor ascended the throne, his personal name, Minning, contained the character "ning," which also appeared in "Guangningmen." The Chinese naming taboo, which forbade the use of characters from an emperor's given name, required a rename. The gate became Guang'anmen, swapping one character for a close synonym. It is a small detail that reveals something fundamental about imperial Chinese culture: the spoken identity of a city's infrastructure could bend to the personal name of a single ruler.

The Qing historian Gu Sen, writing in his "Records of the Capital at Yan," described Guang'anmen's importance plainly: "The gate is a strategic passage for ground traffic from the southern provinces and is of vital importance." Just 15 li to the west stood the Lugou Bridge, the famous Marco Polo Bridge, and beyond it the road continued to Liangxiang County. This was not merely a gate in a wall but a chokepoint in a national transportation network. The original two-story tower with double eaves stood 17.6 meters tall, 13.8 meters long, and 6 meters wide. Combined with the wall, the full structure reached 26 meters, an imposing presence for arriving travelers.

On 26 July 1937, the gate became a flashpoint in the opening phase of the Second Sino-Japanese War. The Guanganmen Incident, as it became known, was one of several confrontations that followed the Marco Polo Bridge Incident earlier that month. The fighting at Guang'anmen contributed to the cascade of events that led to the retreat of Chinese armies to the southern provinces, the fall of Beijing and Tianjin, and the Japanese occupation of the entire North China Plain by the end of that year. The gate that had controlled peaceful traffic for four centuries became, briefly, a contested military position in a conflict that would reshape Asia.

The demolition of Guang'anmen for the construction of Beijing's 2nd Ring Road was part of a larger pattern that stripped the city of most of its historic fortifications during the mid-20th century. Where walls and gates once defined neighborhoods, traffic now flows in continuous loops. The Guang'anmen neighborhood in Xicheng District has become an important business district, anchored by the completion of Guang'an Avenue, one of modern Beijing's main traffic arteries. The Central Conservatory of Music, Beijing Primary School, and Beijing No. 14 High School give the area an educational character. Line 7 of the Beijing Subway runs beneath the avenue. The gate's physical absence has not diminished its role as a landmark; it has simply shifted from stone to syllables, from architecture to address.