本研究的目的是想探討一下「語法分辨法」對小五學生學習輕聲的效果。研究者採用「分層隨機取樣」方式，根據學生去年普通話科的成績，從班中選出九位來自三個不同成績等級（A級、B級和C級或以下）的代表，以他們「前測」和「後測」的結果來作比較；並用這兩個相關樣本的 t 值進行量的分析。研究結果顯示，測驗卷總分30，樣本「前測」的平均分為17.56，「後測」的為23.33，可見那九位學生的「後測」成績有明顯的進步。從這次「行動研究」中，我們可得知「語法分辨法」能有效地提高小五學生學習輕聲的能力。

　　　　　The aim of this action research is to find out the effectiveness of "Grammar Differentiation Method" in teaching Qingsheng in Putonghua to primary 5 students. By stratified random sampling, nine students are selected from three different groups of Putonghua examination results (Grade A, B and C or below) in last year. A pairedsample test is used to analyse their pretest and posttest scores. The results show that the mean of pretest and posttest scores are 17.56 and 23.33 respectiely. The result is statistically significant. It is concluded that the "Grammar Differentiation Method" is effective in teaching Qingsheng to primary 5 students.