目的：本研究的目的在於分別探討棒球投手、野手之動體視力與其投球、打擊表現之相關。方法：以30位2006年杜哈亞運中華成棒培訓代表隊（暨世界大學棒球錦標賽中華代表隊）選手為研究對象，利用Athlevision運動視覺測試軟體分別進行向左、向下、向右、向上等動體視力測試，投打表現則引用中華民國棒球協會所公布95年全國成棒甲組春季聯賽之攻守紀綠。結果：研究發現水平、垂直及整體動體視力間達顯著相關(p<.05)，但左、下、右、上等四種移動方向的動體視力間未達顯著相關(p>.05)；左(DVA-L)、下(DVA-D)、水平(DVA-H)和整體(DVA)等動體視力與投手投球表現達顯著相關(p<.05)；下(DVA-D)、右(DVA-R)、垂直(DVA-V)、整體(DVA)等動體視力與野手打擊表現達顯著相關(p<.05)。結論：本研究認為是動體視力是影響投球和打擊表現的重要因素，特別是投球表現與左(DVA-L)和水平(DVA-H)，打擊表現與右(DVA-R)、垂直(DVAV)有關，由於不同的動體視力有其獨特性，因此建議教練與選手在改進投球或打擊時，宜加強不同的動體視力。

This study investigated the relationship between Dynamic Visual Acuity with pitching (DVA) and batting performance in baseball players. The subjects were thirty players recruited from Chinese Taipei Baseball Second Team of 2006 Asian Games. The athlevision software was used to measure DVA, including DVA-right, DVA-down, DVA-left, and DVA-up, respectively. The data of pitching and batting performance were adapted from the official record of 95-annual baseball tournaments. The result indicated that first, there were significant relationships among DVA-H, DVA-V, and DVA (p<.05), but no significant relationships among DVA-R, DVA-L, DVA-D, and DVA-U (p>.05). Second, the pitching performance had significant relationships with DVA-L, DVA-D, DVA-H, and DVA (p<.05). Third, the batting performance had significant relationships with DVA-D, DVA-R, DVA-V, DVA (p<.05). This study concluded that DVA had an important capability for pitching and batting performance. Particularly, the pitching performance was significantly related with DVA-L and DVA-H, and the batting performance was significantly related with DVA-R and DVA-V. The result indicated that a baseball player should focus on appropriate DVA abilities to improve the skills and performance.