Abstract: Abstract:: A destructive earthquake occurred in 1831 near Fengtai county, Anhui province. Historical archives had consistent records, but the epicentral locations were diverse in different catalogues, having 4 debated sites. After analyzing existing data, the authors had carried on field investigation on the candidate sites of the earthquake. With comprehensive analysis, we consider that the location of macroscopic epicenter should be modified. The new epicenter is at (32.88deg;N，116.89deg;E), and the event name should be revised as ldquo;the earthquake in Southwest Huaiyuan county, Anhui Province, in 1831rdquo;. Meanwhile, the previously estimated magnitude (61/4) is considered to be higher than it should be.