模糊理論是L.A.Zadeh於1965年所提出，為積極承認模糊的存在，而將 其嚴密討論的數學理論。其主要功能在解決不精確事件的量化處理問題，使得人工智慧和人的主觀思想與模糊概念，得以進行定量的研究分析。利用O到1之間的隸屬度評估(或測量)，使得事件的隸屬程度獲得確認，進而進行適當的模糊演算(或推理)，以獲得定量的模糊分析結果。事實上，如果研究分析的主題是模糊性問題、過於複雜尚未找到精確的分析方法、精確的研究方法過於不便而簡易的分析結果仍可接受、或者在緊急情況下無法採用精確分析法時，皆可實際應用模糊理論，進行定量研究分析，其研究結果仍具有特定的效力。在運動科學的研究中，有關運動心理學的問卷探討分析、運動訓練的質與量分配、運動員還材的簡易評暈、特定生理現象的模糊判定、以及運動能力的綜合評價等，皆可直接應用模糊理論，進行適當的定量研究分析。事實上，以「以」為研究對象的運動科學，仍然有相當多的研究領域，可以以模糊理論方法獲得適當的研究結果，值得體育運動界同好共同開發。

Fuzzy theory was advanced advanced by L.A.Zadeh on 1965. Fuzzy theory， a mathematics theory， was strict discussed for vigorous admit fuzzy. The most important function is to deal with problems which change the uncertainty event to value， so the artifical wisdom， the subjective thinking and fuzzy ideal can carry on quantitative research and analysis.
Use the assessment (or measurement) of degree of compatibility among 0 to 1， the degree of membership of evnet was determinded. The results of quantitative fuzzy anslyiss was obtained suitable fuzzy calculations (or inference). In fact， if theme of research is fuzzy problem， precision analysis method is not found， precision analysis method is too discommode and simple analysis method is acceptable， or can't use precision analysis method in state of emergency， they could practically apply fuzzy theory. Their results still inhere special efficiency. One sports science research， the analysis of the questionnaire of sport pschology， the dispensation of sport-training quality and quantity， the simple measurement which choose excellent athlete， and the appraisal of sport capability all can apply fuzzy theory to carry or quantitative research and analysis. In fact， the sports science which use "human" to be subject still have many research coverage， the applicable results， can be obtained by fuzzy theory method. Fuzzy theory is worth to be exploit by the researchers of sports science.