本研究旨在以系統功能語言學(SFL)理論探討科學文本的結構及學生閱讀理解的差異。以現行國中理化課本「溫度與熱」為例，探討︰（一）以SFL理論分析一般中學科學文本寫作的語法結構，及（二）比較學生閱讀傳統文本與SFL文本閱讀理解的差異。
根據言語體裁理論(genre theory)、連接詞關係(conjunctive relations)及名物化(nominalization)三個角度來編寫「溫度與熱」的功能語法文本，並以傳統「溫度與熱」文本為對照組，發展「先備知識測驗」、「前後測驗」及「SFL文本」三個測驗工具。分別以國二學生28人及69人為研究對象，進行兩個實驗︰實驗一探討先備知識、閱讀文本時間、作答時間等與閱讀成就的關係，實驗二探討「高」、「中」、「低」三個先備知識在不同後測向度的表現。
主要發現如下︰(1) 閱讀功能語法文本的學生在閱讀文本時間及作答時間上均高於閱讀傳統文本的學生(2) 功能語法文本對中先備知識學生在應用理解上較傳統文本有顯著幫助。(3) 功能語法文本學生對低先備知識學生在詞彙、字義及推論理解上，較傳統文本有顯著幫助。最後根據研究的結果，討論不同結構的文本對於閱讀理解及閱讀時間的可能蘊涵，並提出進一步的研究建議。

The purpose of this study is to explore the scientific text structures and its effects on reading comprehension. Current edition of physical science textbook is employed as an analysis blueprint. This study consists two parts. First, using the SFL theory to analyze the scientific text structure in junior high school. Second, to compare the effects of reading comprehension between different texts.
Two texts were developed as the reading materials in the present study. The “traditional” text was edited according to the text of the “Heat and Temperature” in physical science textbook, and the “SFL” text of the same topic was re-written according to the principles of SFL, such as “genre theory”, “conjunctive relations” and “nominalization”. These two texts consist 1600, 1400 words, respectively. Two experiments were designed to explore the relations of the four dimensions of reading comprehension and pupil’s prior knowledge. Twenty-eight and sixty-night 8th -grade students participated in these two experiments.
The main findings of this study are as follows︰(1) Students who read the “SFL” text spent more time in reading-text and doing-posttest than those who read the “traditional” text. (2) SFL text was more helpful for middle prior knowledge students in applying text-related comprehension.(4) SFL text was more helpful for low prior knowledge students in the vocabulary, literal understanding and making inference. Drawing upon the findings, the implications of science text writing were discussed, and directions for future study were proposed.

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