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Under the background of modernization and globalization, dialects have declined. Dialect is the carrier of regional culture and the important sign and content of regional cultural identity. The loss of dialect means the lack of regional culture. Therefore, the study of dialects is of great significance. In this paper, the spatial smoothing tool of GIS and Floating Catchment Area (FCA) are used to study the distribution of Hakka dialect in Hunan Province. The research shows that the Hakka dialects in Hunan are mainly distributed in the eastern and southern border areas of Hunan Province, especially in the southeast. There is no distribution of Hakka dialects in the central, northern and western areas.