In history, Yang's ruling center was Qiuchi in Wudu, Gansu Province. He once had a place of Dangchang, Songpan, which is near Guankou, and sent troops into Sichuan. Sichuan is the old place of Qiang and Di people, so it is easy to be awed by his military power. Therefore, it became the origin of the so-called Guankou God since the Tang and Song Dynasties (Ten Theories on Jiangcun, Shanghai People's Publishing House, 1957) to establish a temple to worship. Zhao Kuifu also agrees that Erlang is the god of the Di nationality, and with abundant historical data, it is proved that the ancestors of the Di nationality first lived in the northwest of China, and they have always maintained the custom of "brushing their forehead for the sky", that is, carving marks on their foreheads with a knife, and then smearing ink on the wounds to make them grow into the meat, forming permanent marks that look like a stand-up. In the Eastern Han Dynasty, the Miao people spread from Longnan to northern Sichuan and Xikang. There are not only many temples of Erlang God in this area, but also many people who are famous for Erlang, the most famous of which is Erlang Mountain in Xikang. There are three records in Qionglai County Records: "There are many blue-faced statues in ancient temples in central Sichuan ... with vertical eyes on their heads", which reflects the religious remains of the people in Lailai. After the Tang Dynasty, the Di people gradually merged with the Han and Tibetan people, and the three-eyed ancestor of the Di people, Erlang God, became a member of the immortal world of the unified Chinese nation. The Tsing Yi gods in Gansu and Tibet are also three-eyed. I am afraid that many of them are related to the integration of Tibet and Tibet, and they are not from India as some scholars have said (The Origin of the Three-eyed Gods and the Di People, Knowledge of Literature and History, No.6, 1997).