Abstract：Sequences of 13 introns from 15 Cetartiodactyla species were determined to reveal the phylogeny of cetaceans Our results support the monophyly of the traditionally accepted suborder Odontoceti (toothed whales),placing the dwarf sperm whale (Kogia sima), a representative species of superfamily Physeteroidea,as sister to other toothed whales. Within the superfamily Delphinoidea,phylogenetic analyses identified a sister relationship between Delphinidae and Monodontidae+ Phocoenidae. A close relationship among four genera (Sousa, Tursiops, Stenella, and Delphinus) is strongly supported, which suggested the monophyly of the Sousa-Stenella-Tursiops-Delphinus complex. Neither the two Tursiops species (T. truncates and T. aduncus) nor the two Stenella species (S. coeruleoalba and S. attenuata) examined in present study clustered together, which strongly supported the paraphyly of these two genera as suggested in previous studies. Furthermore, the present Bayesian inference with a lognormal relaxed molecular clock provided divergence time for each clade, which is consistent with previous estimations based on mitochondrial and nuclear DNA data. Based on this study,we proposed that nuclear introns hold great promise for resolving persistent problems in cetacean phylogeny.