During the calendar year of Daizong, he listened to Mahayana belief theory and Nirvana Sutra in the crock temple. On Mahayana Letters from Yuan Xiao, a Silla of Buddhism and Tibetan Studies in Huainan. Later, I went to Tianzhu Temple in Qiantang (now Hangzhou) to listen to Hua Yanzong's "Hua Yan Jing". In 772 (the seventh year of Dali), he went to Tunxi again to learn the "Three Theories" from Hui Liang. In 775 (the tenth year of Dali), he went to Suzhou to learn from Zhan Ran, a scholar of Tiantai Sect, about the crown of Tiantai, Fahua and Weimer. Go back and see the tauren bell meeting, Jingshan Daoqin and Luoyang Wuming under the God of River Ze, and ask Nan Zongchan. Exploring the Zen of Northern Sect from Hui Yun. He extensively studied the religious meanings of Dharma, Zen, Three Theories, Tiantai and Huayan. He also studied classics, Confucianism, history, primary school, Erya, Tianzhu four virtues, various departments, surrounding environment, five Ming, secret spells and rituals. In 776 (the eleventh year of Dali), after visiting Wutai Mountain and Emei Mountain, I returned to Wutai Mountain and stationed in Huayan Temple of Xida University to practice the confession method. At the same time, at the request of the temple owner Xianlin, he talked about the Huayan Sutra. In the lecture, I deeply felt that Hua Yan's old prose was complicated and confusing, so I made a wish to write a new prose. From 784 (the first month of the first year of Xingyuan) to 787 (the third year of Zhenyuan), he wrote 20 volumes of Hua Yan Jing Shu and gave lectures at this temple and Chongfu Temple. He also made dozens of new volumes of sparse scriptures for disciples such as Rui Monk, namely "Ten Square Guangfo Huayan Classics Sparse the Banknotes" (later generations will publish the sparse scriptures and banknotes together, referred to as "Huayan Classics Sparse the Banknotes"), so it is called "Huayan Shujing Master". In 796 (the 12th year of Zhenyuan), he was invited to Beijing to assist the chef Sanzang Prajna in translating the Huayan Sutra, which was entered by the South Indian Bird Tea King, and then distributed it to the Vatican. He was responsible for the examination and approval, and it took him two years to translate Hua Yan Jing into forty volumes, which is commonly known as Hua Yan in later generations. After the court ordered him to live in Caotang Temple in Zhong Nanshan, Shaanxi, and wrote ten volumes of Zhen Yuan Xin Jing Hua Yan Jing Shu. The following year, on Tang Dezong's birthday, he was sent to Beijing to preach Hua Yan Jing in the palace, and was named "Cool Teacher". Soon after, as a witness, he participated in the translation of Dalagni Sutra, a master of guarding national borders. He died in 838 (in March of the third year of his reign), aged 102 (according to the Biography of Longxing Buddhism, Volume 25).

Master Cheng Guan has more than 100 disciples, including Guifeng Zongmi, Du Dong Sangrui, Hai Yin Fayin and Ji Guang, and is known as the "four philosophers of Cheng Men". It was Zongmi who inherited his legal system and was honored as the fifth ancestor of Huayan Sect, and was called "Master Guifeng" by the world.

Cheng Guan wrote more than 400 volumes of Hua Yan Jing Shu and talked about Hua Yan Jing more than 50 times. His works include Dafang Guangfo Huayan 60 Volumes, Dafang Guangfo Huayan Yiyan Chao 90 Volumes, Huayan 65,438+00 Volumes, Dahua Yanjing Law 65,438+0 Volumes, Jin Xin Huayan Jing Qi Chu Jiu Hui Song Shi Articles 65,438+0 Volumes, Hua Yanjing. What is lost is the concept of 1 Volume 12 karma.