The monk CheongHoe is considered one of the famous Seon muster of the middle Choseon dynasty. He composed one piece of Buddhist Gasa named in Korean, lots of Gatha(偈頌)s and essays in Chinese throughout his life. He differed from other monks by his composition of Gasa in Korean and Gatha in Chinese, and especially in his way of Buddhist teachings and the way he expressed it in his Gasa. I studied the relationship between and CheongHoe`s thinking style. Firstly, I found that CheongHoe expressed his thinking frame of the accord between Confucianism and Buddhism, Seon and chanting in his . He thought the ideal Buddhist paradise named JeongTo(淨土) is same to the ideal Confucious paradise named YoSoon world. So he persuaded all general people to practice Amitable(阿彌陀佛) chanting and Confucian ethics at the same time in order to go to the Buddhist paradise named JeongTo(淨土) and the ideal Confucian paradise named YoSoon world. But next to this, he taught the Buddhist people the JeongTo practice that is the way of chanting in his Gasa . And he introduced two kinds of chanting those are the westhern JeongTo(西方淨土) and mind JeongTo(惟心淨土), and explained how to chant them each. Plus he described the all Buddhist people doing chanting practice, although they were Seon muster in the later part of his Gasa . Secondly, I researched CheongHoe`s thought which were the accord among Confucianism and Buddhism, Taoism in general thinking, the accord among Seon Buddhism(禪) and theoretical Buddhism(敎), chanting Buddhism in Buddhist thinking. Even though he insisted two kinds of accords among them in his life, he expressed the accord between Confucianism and Buddhism, Seon and chanting in his . The reason why he expressed the accord between Confucianism and Buddhism in his Gasa is that he intented to propagate Buddhism more widely and effectively in Confucian Choseon dynasty without severe criticizing from Confucian people. And he expressed the accord Seon and chanting in his in order to let more people follow chanting practice. In addition, I confirmed the fact that the Seon muster CheongHoe is the writer of Gasa by comparing the Buddhist Gasa with CheongHoe`s thinking style. He expressed the accords between Confucianism and Buddhism, Seon and chanting in his in order to propagate Buddhism more widely, in order to have more people practice chanting.