The purpose of this study is to investigate whether explosiveness affects the tennis serving skills of young tennis players. Participants in this study consist of 18 adolescent tennis players and divided into two groups, elite and ordinary. Independent samples t test and multivariate regression analysis with significance level set at α = .05. In serving skills, the ordinary groups players' serve accuracy better then elite groups players (22.96%, 41.11%; p ＜ .05); the elite groups players' serve speed better the ordinary groups players (150.26 km/hr, 116.67km/hr; p ＜ .05). In explosiveness and serving skills, were significant between lateral sprint after box vault and serve accuracy and speed in zone A, B, C; and significant between box vault training and serve speed in zone A (p ＜ .05). This study found that a powerful serve is sufficient to create a chance to win even if ball placement is poor in the youth tennis match. Once the serve can be precisely controlled, players will be able to place the ball where opponents are weak and therefore improve their scores. Ordinary players, by contrast, must increase the speed of their serve to improve accuracy. If speed is not high enough, it will not pose a threat to their opponents. Additionally, this study finds that box vault training and lateral sprinting after box vault will increase lower limb balancing ability and explosiveness, which will help increase serve accuracy and speed.