/kloc-In the 7th century, Sufism was introduced into Xinjiang from Bukhara and Samarkand in Central Asia, forming Baishan School and Heishan School, commonly known as "Yi Chan". Since18th century, Sufi schools such as Kublin, Kadirin, Hu Feier and He Zherenye have been introduced into Gansu, Ningxia and Qinghai from Arabia, Central Asia and Xinjiang. Under the influence of China's traditional cultural thought, Mohammad, Dawantou, Dagongbei, Huasi, Guanchuan and other branches have gradually formed, and Bijiachang and Beizhuang are named after Gongbei or Daotang. Named after the founder's surname, there are Xianmen and Zhangmen. Named after the image of the founder, there are Humen and so on. Because there are many Gongbei and magnificent buildings, Dagongbei and Huasi are named after them, but they are not called knockers.