重要他人信念對兒童信念及行為選擇的影響，在家庭背景中已獲得頗為一致的發現，運動訓練情境中，知覺教練信念可能對選手信念和退出意圖有顯著的預測力。本研究主要目的在以運動訓練情境為背景，檢驗Eccles等人(1983)期望-價值理論模式，探討知覺教練信念是否對選手信念和退出意圖有顯著預測力，以及知覺教練信念是否會透過選手信念為中介，進而影響選手的運動退出意圖。研究結果發現知覺教練信念(能力期望、需求努力、工作價值、重要他人期望代價和失敗的心理代價)要素中，只有工作價值能顯著預測選手信念和退出意圖。另外，選手信念(能力期望、需求努力、工作價值、重要他人期望代價和失敗的心理代價)要素中，同樣也只有工作價值能顯著預測退出意圖，並且知覺教練信念會透過選手信念為中介影響選手的退出意圖。

　　There has been a consent finding in family context study for influence of significant others to children’s expectancy and value beliefs and behavior choices. In sports, adolescent athletes’ perceptions of coaches’ beliefs may also influence adolescent athletes beliefs and drop-out intention. In this study, based on Eccles et al’s(1983) expectancy-value theory, we proposed that adolescent athletes’ perception of their coaches’expectancy and value beliefs could predict their intention of drop out of sports. Meanwhile, this prediction was mediated by adolescent athletes’ own expectancy and value beliefs. Results showed that perceived coaches’ beliefs predict adolescent athletes’ drop-out intention, but perceived task value belief was the only significant predictor. It was also found that adolescent athletes’ own beliefs mediated the relationship between perceived coaches’ beliefs and adolescent athletes’ drop-out intention, but task value belief was again the only significant mediator.