Eight cases of Buddhism spread in Han Dynasty were 1. Department of law, 2. Hua Yanzong, 3. Tiantai Sect, 4. Three schools of thought, 5. Faxiangzong, 6. Tantric, 7. Zen and 8. Pure land Sect The characteristics are as follows: 1. Legalists, based on the five laws and four divisions, advocate observing the precepts formulated by the Buddha to control daily thoughts, behaviors and concepts. If you stop for a long time, you can prove the Buddha's fruit. 2. Hua Yanzong, based on Hua Yanjing, shows the origin of legal circles, the wonderful use of Ten Xuans and Six Phases, and shows the purport of clarity and harmony of everything. 3. Tiantai Sect, mainly based on Hokkekyo, uses three truths to explain the universe, saying that practice needs to break three mysteries, so breaking mysteries is a matter of one mind and three views. 4. The three schools of thought based on Zhong Lun, Bai Lun and Twelve-person Theory believe that everything in the universe has no fixed self, and it changes with the relationship of karma. The so-called predestined relationship means that the self is empty, and it advocates understanding and releasing the nature, freeing the heart circulation and proving the vacuum. 5. Fa Xiang Zong is based on the theory of yoga master Shen Jiemi's sutra, geocentric theory and epistemology. It holds that everything in the universe changes in knowledge, and "the three realms are idealistic, and all laws only know". Knowing all the realities, you can turn knowledge into wisdom and prove the wisdom of becoming a Buddha. 6. Tantric Buddhism, based on Mahayana Sutra, Diamond Sutra and other mantras and esoteric teachings, is based on the teachings of the Six Great (namely, earth, water, fire, qi and knowledge), the Four Mans (namely, the four mandalas of Mahayana, Dharma and karma) and the Three Mans (namely, body, mouth and mind), which means that the three secrets correspond to each other, and you can realize your body instantly. 7. Zen Buddhism, without words or writing, emphasizes cultivating the mind, communicating with the heart, pointing to the heart, and treating nature as a Buddha. 8. Pure Land Sect, based on Amitabha Sutra, Infinite Life Sutra and View Infinite Life Sutra, teaches people to establish faith and make a wish, chanting Buddha as a way to the paradise, where they are taught by Amitabha and live indefinitely until they become Buddha.