In various sports, exerting explosive power in a short time is an important ability that affects performance. The contact mat and smartphone app measure the height of the vertical jump based on flight time. However, it has been reported that the flight time method has errors depending on the landing posture compared to the impulse method, which calculates the impulse of the ground reaction force. This study aimed to examine the effect of jump training with different feedback (jump height from impulse and flight time) on jump height and the amplitude of jump height overestimation (the difference between the jump height from impulse and the jump height from flight time). Nine participants were divided into two groups that received jump height of flight time method feedback group (FFG, n = 5) and jump height of the impulse method feedback group (IFG, n = 4). The participants started their respective immediate feedback training twice a week for four weeks. The training programs included 5 sets of 4 repetitions countermovement jump. The results indicated that comparing pre to post-measurement IFG jump height increased by 14.5% (effect size (ES) ± 95% confidence interval = 2.85 ± 2.13). FFG jump height increased by 17.9% (ES = 1.51 ± 1.44). IFG jump height measurement methods difference increased by 71.2% (ES = 0.77 ± 1.45). FFG jump height measurement methods difference increased by 215.1% (ES = 2.20 ± 1.64). these results indicate that providing flight time method was equally effective in the impulse method, but training by flight time method may have learned to movements in a way that flight time is increased.