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Investigation of Reynolds number effect on flow asymmetry over different scale slender bodies at high incidence was conducted.Aerodynamic characteristics of smooth models at high incidence were obtained to evaluate sub-critical Reynolds number effect on flow asymmetry.And the effect of critical Reynolds number or above was obtained by fixed transition.Results show that increasing of velocity affects the flow asymmetry by changing the intensity of the vortices; Diameter of slender bodies affects the distance between the main vortices, Which determines the stability of the vortices and results in the discrepancy in the flow asymmetry over different scale models.