Abstract: To study the aerodynamic performance of the soccer ball, computational models with/without spinning are set up and verified with previous studies. It is shown that the separation lines on the surface of the soccer ball are very different from those on a smooth ball surface due to presence of the seams. It is shown that the seams greatly affect the three-dimensional separation and the lift force acted on the soccer ball in non-spinning case. In the spinning case, not only the Magnus force but also the drag acted on the soccer ball increase with the increase of the rotation speed. Furthermore, the effect of spinning on the flight trajectory of the soccer ball is discussed with the penalty kick as an example.