In this study, for the purpose of securing basic data and examining the production characteristics of pottery produced in Aragaya, 57 pieces of pottery excavated from the kiln of Haman Ugeo-ri Ⅴ and 22 pieces of kiln construction facilities were selected and compared by type and the homogeneity of the production raw materials was reviewed. As a result, most of the earthenware was made with thin walls and carefully selected clay, and smooth and dense cross-sectional structure and color change of the core were confirmed due to firing in a high-temperature environment of 1,300℃ or more. Additionally, considering the differences in chemical composition for each type, it is presumed that different raw material preparation processes were used depending on the firing degree intended by the potter. In the case of some samples that do not match the actual firing degree, it is judged to be a failure product or the result of multiple re-firing. As a result of analysis of the kiln construction section facility, mica and chlorite were detected in the weathered rock layer corresponding to the lowest layer of the combustion zone, so it appears that high temperatures were not reached in this section. On the other hand, high-temperature generated minerals such as Cristobalite and Mullite were detected in the soil of the fired section, indicating that it was fired at high temperature. Compared to the kiln-built facility, a higher viscosity composition of earthenware clay is confirmed. Therefore, it is presumed that earthenware was made using soil with higher plasticity than kiln-building facilities. In addition, since the clay content of the kiln construction facilities showed a more diverse composition range than that of earthenware, it is assumed that clay of various compositions was used when repairing the kiln.