Abstract: The carangiform propulsion has been paid much attentionin recent years. In nature, the fish may have many kinds of tail shape, butonly a few body shapes. This paper studies the influence of the body shapeon the carangiform propulsion. Two body models are used in numericalsimulation: model A, the fish normal body shape; model B, the submarine shape.The tail takes a crescent shape. Thestrouhal number (St) is chosen as the main parameter, and the combinedtranslational-rotational oscillations are taken as the motion of tail. Thehydrodynamical force is calculated by the software FLUENT. The results showthat the body shape does affect the carangiform propulsion, the fish body shape is beneficial tocruising as a result of the nature evolutional selection.