The purpose of this research was to analyze the kinematic characteristics of the taekwondo axe-kick Five female and three male athletes from the National Taiwan Normal University taekwondo team served as the subject. Their mean age, height, weight, and train experience were 20.29 ± 1.39 years, 165 ± 7.5cm,59.65 ± 8.25kg,8.25 ± 2.38years respectively. One Peak high-speed camera (120 f/s) was used to collect the kinematic data. The selected variable were tested by using the SPSS t-test program. The results were following: 1.Flex-stretching axe-kick has faster attacking time (0.37 ± 0.02s) and velocity (5.55 ±.0.39m/s) than the straight axe-kick (.042 ± 0.01s and 4.70 ± 0.56m/s). Both reach significant difference. 2.Straight axe-kick has a better attack effect. The attack velocity on target is 7.74 ± 0.75m/s for straight axe-kick and 5.97 ± 1.10m/s for flex-stretching axe-kick respectively. Both reach significant difference. 3.The straight axe-kick has a maximum velocity (9.87 ±0.93m/s)during the attack than the flex-stretching axe-kick(8.85 ± 1.24m/s).Both reach significant difference. 4.The body center of mass (CM) reach the highest point during the straight axe- kick hitting the target, however the body CM reach the highest point after the flex-strengthening axe-kick hitting the target.