Master Zhuyun (1919-1986) came to Taiwan with the National Army in 1950, he was led a vagrant life. In the process of becoming a monk, he experienced hard work. He also encountered many difficulties, but these blows did not make him lose confidence. After coming to Taiwan, he actively introduced Buddhism to the people of Taiwan and changed bad habits in Taiwan Buddhism. Later, he advocated chanting Dharma to change the Buddhist atmosphere in Taiwan.He also guided the public to learn Buddhism through the promotion of the legal meaning and the use of popular methods to propagate.In his life, he mainly promoted the method of Pure Land, so he founded the " 7-day Chanting Retreat". During the event, observe strict rules, make unremitting efforts, and chanting Dharma in a persevering manner. He advocated chanting the Buddha aloud and chanting " Namo Amitābha" to practice. By exploring the content and practice methods of "7-day Chanting Retreat ", as well as the efficacy and experience of chanting the Buddha, to understand the reasons why Master Zhuoyun advocates "7-day Chanting Retreat ".By analyzing the thoughts of the past ancestors of the Pure Land Sect, we can understand the development of Pure Land in Buddhism. And through the scholars' research on the literature and the interpretation of the pure land thought, it analyzes the origin of Master Yunyun's thoughts. Learn more about how Master Zhuoyun practiced his "7-day Chanting Retreat" to practice his pure land thinking, and confirmed it from its efficacy and spiritual experience. It also reveals the transformation and improvement of "7-day Chanting Retreat " and fulfills the aspiration of " Egoism and Altruism " by Master Zhuoyun.