Byulsin－gut is the special ritual of villages in local society. These rituals transmitted by three ways. That is, in a rural society, or in a seaside society, and in a market placed in downtown. In rural society almost of inhabitants participate in that ritual oneself, but in seaside society the performance of ritual mainly realized by shamans group. And in market placed in downtown the performance of ritual also nearly realized by shamans group and professional artists. Tal－Gut and Geori－Gut is a dance that is performed as part of the Donghaean Byulsin－Gut and also as part of the Gut(a Korean shamanic performance). It is a mask performance that is done by shamans wearing masks. Out of all the mask plays that have been passed down, it is the most dynamic with ceaselessly reinvented and lively characteristics, which clearly distinguish it from other tamed and lifeless mask plays, and that is why it is designated as a cultural asset. Tal－Gut and Geori－Gut persists as a living entity in a Gut performance which mirrors real life. It also reflects the situations of the times, communicates well with the audience, and remains 'a living art' that is constantly reinvented. This is why the mask play is actively studied. This study is intended to examine the changes and reinvents of Tal－Gut and Geori－Gut, and its festivities. To begin with, the modification and reinvention of Tal－Gut and Geori－Gut result from macroscopic social shifts in various spheres such as the culture, the policy and the economy of the community concerned and also from immediate factors that depend on the mood of each performance.