The purpose of this study was to analyze AMS radiocarbon dating, using wiggle match, of a charcoal column excavated from a fired dwelling site (ra-#8) at the Pungnaptoseong earthen wall made in Baekje era. The result of wiggle matching for 6 decadal single-ring samples of the charcoal produced ±2σ radiocarbon date (95.4% confidence interval) as A.D. 190～280. It indicated that the dwelling site (ra-#8) belonged to the early and middle of the 3rd century. Radiocarbon dating results confirmed the date speculated by archaeologists according to dwelling structure and pottery style.