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To investigate the effects of seawater carbonate chemistry changes caused by ocean acidification (OA) on early developmental stages of marine benthic calcifying organisms, we exposed eggs and larvae of Argopecten irradias, an important species of bivalve in Chinese aquculture, in seawater equilibrated with CO2-enriched (1000 ppm) gas mixtures.We demonstrated that CO2-driven OA significantly interfered fertilization and larval development and resulted in a higher aberration rate.Fertilization in CO2 treatments (pH 7.6) was 74.3±3.8 %, 9.7% lower than that in control treatments (pH 8.3) (84.0±3.0 %).Hatching success decreased by 23.7% and aberration rate increased by 30.3% under the acidified condition.