裝飾材是構建空間的基礎，做為空間中最表面的皮層，裝飾材的種類甚多，特性豐富多變，例如：裝飾材表面是偏冷色還是暖色；透明、半透明還是不透明；粗糙還是平滑……等，很多無法明確界定之特性，使得空間呈現一種曖昧的狀態。本研究以模糊理論中隸屬函數觀念探討並量化裝飾材影響因子，分析裝飾材對建築空間的影響。故本研究之目的如下：（一）探討空間裝飾材重要因子、權重，用於後續計算空間之隸屬函數值。（二）探討以模糊理論建立一套裝飾材評估模式之可行性。（三）研究裝飾材不同因子在空間中的搭配對於空間之影響力。經本研究探討，裝飾材各項因子權重分別為，色彩：0.33；肌理：0.23；透明度：0.17；光澤：0.14；粗糙度：0.13，權重占最高為「色彩」。文末以高雄圖書館總館做為印證評估空間模式之實證案例，從計算結果中可知，整體空間隸屬函數值為0.31，屬於偏公共空間型態，與現況之空間類型相符。經研究可知，考慮空間中裝飾材之各項影響因子，可用模糊理論之隸屬函數值觀念予以客觀解釋。本研究僅針對圖書館空間做裝飾材方面探討，尚有更多不同類型之空間及不同空間因子可做探討，也可針對單一空間因子做更深入的學術探討。研究成果可提供規劃圖書館空間之設計者，以及空間設計學習者於配置材質時之參考。

Decorative materials form the foundation of constructing space and constitute its outermost layer. There are numerous types of decorative materials with diverse and abundant characteristics, such as whether the decorative material surface exhibits cool or warm tones, transparency, semi-transparency, or opacity, roughness or smoothness, and more. Many of these characteristics cannot be precisely defined, resulting in an ambiguous state within the space. This study employs the concept of membership functions from fuzzy theory to explore and quantify the influencing factors of decorative materials, analyzing their impact on architectural space. The objectives of this study are as follows: 1. Investigate the important factors and weights of decorative material characteristics to calculate the membership function values of spaces. 2. Explore the feasibility of establishing a material evaluation model using fuzzy theory. 3. Study the influence of different factors of decorative materials and their combinations in space on the spatial environment. According to research statistics, the weights of various decorative material factors are as follows: color: 0.33, texture: 0.23, transparency: 0.17, glossiness: 0.14, roughness: 0.13, with the highest weight attributed to "color". At the end of the study, the Kaohsiung Main Library is used as a practical case to validate the assessment model. From the calculated results, it can be observed that the overall spatial membership function value is 0.31, indicating a leaning towards a public space type, which aligns with the current spatial classification. Through this research, it is evident that considering the influencing factors of decorative materials in a space allows for an objective interpretation using the concept of membership function values within fuzzy theory. This study only examines material aspects in library spaces, However there are many other types of spaces and factors that could be explored. Additionally, deeper academic investigations could be carried out on specific individual spatial factors. The research results can provide a reference for designers planning library space and space design learners when arranging decorative materials.