本研究的目的是利用試題反應理論編製國中男生壘球擲準測驗。受試著為六百三 十七名國中男生，每位受試者試做 25 次壘球擲準，所得的結果利用 Facets 軟體進行二層 面評分量尺單參數對數模式估計， 檢定 " 測驗資料 "、" 資料和模式的適合度 "、" 估計 個人能力 " 和 " 測驗參數 "，依試題反應理論編製國中壘球擲準測驗，並建立測驗的信度 ．效度和常模。本研究的成果可以提供學校體育教學一個精確、先進的測驗，用以有效提昇 壘球投擲技能的評量效果。

　　　　　The purpose of this research was to construct the testing of overhand throw for accuracy by using the item response theory. The subjects of the research include 637 junior high school boys. Each subject accepted the overhand throw for accuracy test 25 times. We analyzed the result through Facets software to carry out the rating scale of single parameter and logistic mode estimation, qualification examination data, aptness of data and mode, to estimate personal abilities and testing parameter and to construct the overhand throw for accuracy test depending on the item response theory. Testing reliability, validity and normal mode for junior high school were also set up. The achievement of this research can offer physical education a precise and advanced test to promote the testing effect ofsoftball skills usefully.