Abstract: The carbon stable isotope curve was constructed in this paper from the Huanghuachang sections of Lower Ordovician in the eastern Yangtze Gorges area.δ¹³C data demonstrate that there existed two δ¹³C positive excursions (C1, C3) and two negative excursions (C2, C4), all of which are comparable in the global scale.Based on the sedimentary sequence characteristics of Lower Or-dovician in the eastern Yangtze Gorges area, the authors observed that the curve of δ¹³C is coincident with the curve of the regional sea-level fluctuations.This study indicates that the geochemistry as well as the sequences was well controlled by the sea level changes.