This study developed a mathematical model of the ball flight to simulate free kicks under virtual matches, trying to point out the required final conditions that are connected with the successful curving free kicks. It could be observed through the realistic measurement of the kinematical parameters under the initial conditions and the flight trajectory in curving free kicks of soccer. Three male soccer players in the national team volunteered to join the study. In addition, the average age was 19.7±1.5 years, the average height was 174.7±1.5 cm, and the average weight was 68.0±5.2 kg. This study employed 2 Redlake high-speed cameras and 4 JVC digital cameras to take the flight initial conditions and the flight trajectory with 250 Hz and 120 Hz separately in the course of shooting. Furthermore, the films were digitized with the Ariel Performance Analysis System to determine the flight parameters in order to carry on the discussion. The valid sampling size was 19 totally. The results showed that the rotation of the ball would generate Magnus effect during the flight to make it subject to the lateral force perpendicular to the direction of the spinning axis. The lateral deflecting displacement that resulted from lateral force would cause a distinct change for flight trajectory. In addition, the correlation reached more than .93 between fitting and predicting equations of the flight trajectory that could predict flight path efficiently. With the prediction through the computer simulation, the results indicated that while the kicker was facing the true match situation, he could employ different flight parameters, including projection angles and direction angles, and so on, to draw up the different tactics of shooting for avoiding the layers of defense of the opponent's wall and goalkeeper. The most important was that the kicker could attack the goal post directly to score with the curving free kick successfully.