本論文旨在利用有限元素法來進行不同面積尺寸鋼製防火門扇背溫之研究。本文採用有限元素分析軟體ANSYS為數值模擬工具。受熱面以CNS11227升溫曲線加熱於一扇原始尺寸之鋼製防火門。將數值模擬的結果與實驗數值比對，證實結果之可信度後，再以相同厚度、不同面積之縮小防火門扇，進行一系列不同面積對於門扇背溫之分析，最後再以相同面積但不同寬、高之比例之改變來確信門扇面積大小為影響門扇背溫之主因。其中面積縮減法必須建立在骨架規格相同且門鎖大小不得變更之上。可做出以下結論:
(1) 在相同面積縮小比例之下的防火門扇，門扇寬度之縮減對於溫度方面的影響比高度之縮減來得大。
(2) 門扇面積尺寸進行縮減時，應該依照不同比例縮減之後，有不同的背溫規範。

The purpose of this study is to investigate unexposed temperature distribution of steel fire doors under different areas by finite element method. In this paper, the finite element software ANSYS is used for numerical simulation tool. CNS 11227 time-temperature curve is exposed on one side of a fire door. After comparing the numerical simulation results with experimental data, the accuracy of the solutions by the finite element software is confirmed. And then, we make a series analysis of the unexposed temperatures under different fire door areas with same door structure. Finally, we try to make sure that the primary effect of the unexposed temperature is door area by analyzing a series of the same area fire doors but different ratio of wide and height, which the way of area reduced should be established on the same specifications skeleton and the same lock. One can conclude that:

(1)The wide reduced effect of unexposed temperature at area ratio is bigger than height reduced effect.
(2)There should be different unexposed temperature requirement when the door size is reduced to different ratio.

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