在過去二十年來，游泳技術不斷在演變，改變的原則在於泳者能否有效的運用全身的力量，現今在仰式的踢腿技術上也有重大的改變，由以往的雙腿交叉向上拍打變成蝶腳打水，一般選手在過去使用仰式的蝶踢幾乎只有出發和轉身的時機，最新的仰式技術則是將蝶式踢腿應用在整體的划水動作上，以期提高前進速度。但改變了踢法，整體動作一定會受到影響，想發揮蝶腳仰決的優點，不但截手需配合巡當，踢腿的時機更是蝶腳仰泳最需注意的地方，其他還有很多因素如蝶腳仰泳踢腿頻率，使身體保持旋轉，蝶腳仰泳腿振幅，保持身體的穩定性及協調性等等都需鬥入考慮，因此本文除了介紹蝶腳仰泳的優點在於增日前進的推動力，彌補傳統仰泳在划水初期速度不足的缺點，對於上述相關配合因素也一併在文中討論，以期提供給游泳教練及選手參考。

　　　　　During the past twenty years, the evolution of the swimming technique has kept going on. The principle of changing depends on whether the swimmer can make the best use of the power generated from the whole body. By now the kicking technique of backstroke will, therefore, change a lot according the principle. It changes from the traditional kicking to upbeat butterfly kicking. The swimmers used the upbeat butterfly kicking only within the starting and turning in the past. The latest technique of back applies the upbeat butterfly kicking to whole course of race so as to improve the forward speed. But whole motion will be affected as the result of the new kicking technique. To perform the new technique well not only needs the proper stroke but also the other elements including the frequency of upbeat butterfly kicking, keeping the body rolling, the amplitude of vibration of upbeat butterfly kicking. And keeping the upper body steady and coordinated. The most important is that the kicking should be in the right time. The purpose of the study is to introduce the function of the new technique which is to make up for the shortcoming of the traditional kicking technique. Besides, we will discuss the elements which are mentioned above. We hope the study can help coach and athletes achieve great performance.