Because Peking Opera is a type of opera formed in Beijing.
Since the highest ruler of the Qing Dynasty loved opera, it has become a practice to hold celebratory performances every time the emperor and queen mother celebrate their birthdays or the royal family celebrates. In the autumn of 1790 (the fifty-fifth year of Qianlong's reign), in order to celebrate the 80th birthday of Emperor Qianlong, Yangzhou salt merchant Jiang Heting (from Anhui) organized an Hui opera troupe called "Sanqing Troupe" in Anqing, led by artist Gao Langting to Beijing. Attend a birthday performance. The Sanqing Troupe came to Beijing originally just to perform in the palace to celebrate birthdays. Because the Hui opera has beautiful tunes, easy-to-understand scripts, and the entire stage performance is novel and has a rich flavor of life, it has been warmly welcomed by the Beijing audience. In this way, the Sanqing Troupe couldn't stop after performing the birthday drama, so they stayed in Beijing and continued to perform folk performances. Therefore, Sanqing Class is becoming more and more popular in Beijing. In the process of performing in Beijing, the Hui Troupe absorbed the performance skills of Kunqu Opera, Yiyang Tune, Bangzi Tune and other opera types to enrich themselves, and soon became the most popular opera type at that time. After the success of Sanqing Troupe in Beijing, other Anhui troupes such as Sixi Troupe, Hechun Troupe and Chuntai Troupe entered Beijing and gradually dominated the theater scene in Beijing. This is the so-called "Four Anhui Troupes Entering Beijing".
Han opera is popular in Hubei, and Erhuang, Xipi and Hui Opera in its tone are closely related to each other. Anhui and Han operas had extensive artistic integration before entering Beijing. At the beginning of the Daoguang Period (1821), famous Han opera veterans Li Liu, Wang Honggui, Yu Sansheng, and young actor Long Deyun came to Beijing and sang in the Hui Troupe Spring Stage and He Chun Troupe respectively. After the Han opera actors joined the Hui opera troupe, they integrated the tunes, performance skills and repertoire into Hui opera, making the singing style of Hui opera increasingly rich and perfect. The singing and recitation are more characteristic of Beijing's phonetics, making them easier for Beijingers to accept.
In the twenty-fifth year of Daoguang’s reign (1845), all famous classes had Laosheng as foremen. After the merger of Hui and Han, Hubei's Xipi tune and Anhui's Erhuang tune were exchanged again. The confluence of Hui, Qin and Han Dynasties laid the foundation for the birth of Peking Opera.
Between the 20th year of Daoguang and the 10th year of Xianfeng (1840-1860), Peking Opera was formed through the merger of Hui Opera, Qin Opera, and Han Opera, and by absorbing the strengths of Kun Opera and Beijing Opera.