窗纸作为采光材料，在中国传统建筑中的使用经历了漫长的历史，直到近代才被玻璃所取代。在《威尼斯宪章》和《奈良宣言》明确了“真实性”作为传统建筑保护的重要组成部分之后，“光环境真实性”也逐渐被学者所关注，而窗纸作为构成“光环境真实性”的重要一环，是本文研究的重点。然而在现有的传统建筑保护实践中，很少有人关注对其光环境的保护；现有对窗纸的研究中，也缺乏结合空间的定量分析。因此，本论文通过结合历史研究和定量实验的方法，对窗纸的研究从物理测量，到空间实测，再到计算机模拟，设计了一系列实验，旨在揭示窗纸作为一种均匀漫透射材料的光学特性，并通过实测校核，总结出一种行之有效的模拟方法，以对其他的中国传统建筑进行推广研究。论文最后用两组典型北京四合院空间，列举了一个用模拟方法研究窗纸对传统建筑室内采光影响的实例，以验证该模拟方法的适用性，并探讨窗纸对于传统建筑室内天然光环境的具体影响。

The use of window paper in traditional Chinese architecture has experienced a long history as a light transmissive material, and it was not replaced by glass until modern times. After the Venice Charter and Nara Declaration clearly defined "authenticity" as an important part of the protection of traditional buildings, "lighting authenticity" has gradually attracted scholars' attention. Since window paper makes up a significant part of "lighting authenticity", this paper focuses on the study of its usage in Chinese traditional architecture. However, in the existing practice of traditional architecture protection, little attention is paid to the protection of its lighting features; in the existing research on window paper, there is also a lack of quantitative analysis combining architectural space.Therefore, by combining historical research and quantitative experiments, this paper designed a series of experiments on the study of window paper from physical measurement, space performance measurement, and computer simulation, aiming to reveal the optical properties of window paper as a uniform diffuse transmissive material and sum up an effective simulation method to promote the research of other Chinese traditional buildings through validation experiments. At the end of the paper, 2 typical Beijing Siheyuan courtyards were used to study the effect of window paper on the indoor lighting of traditional buildings, in order to verify the applicability of the simulation method, and to explore the specific impact of window paper on the daylighting of traditional buildings.