Ecologyism and Donghak Gasa many things in common. If ecology has the purpose of presenting the dangers of the here-and-now and future alternatives, Donghak Gasa is also concerned about the present at the end of the Joseon Dynasty and is trying to prepare for the future. This point acts as an element that has a common basis for formation between ecologyism and Donghak lyrics. In addition, the ecology of Donghak Gasa was created by the four generations of decline, who develop ideas according to their status. In other words, although the fallen four generations inherited the ecology of the ruling four generations, the fallen situation recognizes the ecology as a part of life. The harshness of the actual situation is what made the actual appearance of ecology both the same as the general tendency of the high school generation and different. The situation in which the creative class of Donghak lyrics has collapsed is reflected in the reality of ecology. Ecology of Donghak Gasa is that nature or ecology is recognized as a part of the world rather than a place of departure to learn science and go out into the world, and in that sense, ecology is mixed with and indistinguishable from humans. It shows the recognition that ecology is society and civilization. Also, in Donghakgasa ecology, the ecological characteristics of Gyeongju are acting as the main source of literary creation. Therefore, the ecology of Donghak Gasa also shows the characteristic that natural objects that were spread all over the Gyeongju region are accepted as main objects of shape. ‘Yongdamjeong’ and ‘Mt. Gumi’ appear as the main target natural objects. On the other hand, the ecologicalism of Donghak Gasa is an ideological basis, and the cyclical order of the four seasons as seen in Neo-Confucianism is completed, so that all four do not appear, and the moment of changing from winter to spring is emphasized or spring is paying attention. This is an extension and variation of the consciousness that Neo-Confucianism pays attention to the four seasons in ecology and cycles them. However, the ecology of Donghak Gasa is based on Neo-Confucian ideology and cannot be said to be outside of it. Time, which constitutes a major part of ecology, follows the order system of the cycle, and the important time that is emphasized is only highlighted. This discussion is meaningful in that it found the foundation for the generation of the creative class and the thought leading the era at the time of creation in the generation of Donghak lyrics. In addition, the ecology of Donghak Gasa conveys the idea that the nature in which humans live and live is not separated from the civilization created by humans, but exists in a mixture, and follows the Neo-Confucian view of nature that unifies the body and phenomena. Although nature is recognized by dividing it into time and space, just as they are not two, but one, human beings and civilized nature are recognized as one and not each, but clearly related to Neo-Confucianism.