本研究目的在探討世界優秀女子網球選手的發球趨向，並比較不同發球旋轉、落點與型態之間的差異情形。本研究以2009年參加WTA巡迴賽決賽（洛杉磯、辛辛那提、多倫多、史丹佛）的優秀女子選手為研究對象，比賽局次共計86局為研究範園，以網球發球記錄表格為研究工具，將所有資料以百分比、卡方檢定進行統計分析。經分析與討論獲得以下結論：一、世界優秀女子網球選手在發球旋轉方面以平擊球為主(36.86%)，其次為上旋球(36.588%);在發球落點方面以中間身體區為主(38.28%)，其次為外角區(36.16%);在發球型態方面以側旋發外角區球為主(19.6%)，其次為上旋發中間身體區球(17.94%)。二、不同變項（發球旋轉、發球落點、發球型態）之間均達顯著差異。

This study aimed to explore the ball service of world's outstanding female tennis players, with the focus on the differences of service spin, fall point of ball and service type. The female tennis players in the finals of the 2009 WTA Tour, who won the competitions in L.A., Cincinnati, Toronto, and Stanford, were taken as the research objects, with 86 rounds of competitions as the research scope, and the record form for ball service as the source of data for the research method. The collected data were analyzed statistically via percentage comparison and Chi-square test. The conclusions elicited from analysis and discussion, are as follows: 1 .As for the service spin among the world's outstanding female tennis players, the flat stroke is the most common (36.86%), followed by the topspin (36.588%); the ball is served mostly toward the receiver’s body or the center of the tennis court (38.28%), followed by the direction toward the alley (36.16%); in the service types, the sidespin service towards the alley is the majority of cases (19.6%), followed by topspin towards the receiver’s body or the center of the court (17.94%). 2. Several variances (the service spin, fall point of ball, and service type) reach significant differences.