当今社会正处于数字化浪潮的全新洗礼时期，而数字人文学科也正在经历着前所未有的发展。传统的人文研究范式在跨学科融合和创新变革的过程中，得到了数字技术的强力推动，从而以更广阔的视角和更多元的维度拓展了人文研究的深度和广度，赋予了其新的活力和生命力。其中，书信作为历史文献资源的重要组成部分，具有其无可替代的价值和意义。在民国这个政治格局重塑、经济动荡、思想激荡的关键历史时期，涌现出了众多具有前瞻性思想和卓越才华的学者。而在电报等现代通信方式尚未普及的年代，书信成为了他们主要的交流纽带，记录下了他们的生活、工作和交友。在这些民国学人中，胡适以其多样的社交圈层、善于结交朋友的特质、以及收集自己一生中书信的良好习惯，使得他的书信量十分丰富并且得以完整地保存下来。因此，后人也致力于收集整理研究他的书信并将其出版。
本文以《胡适中文书信集》作为研究对象，利用文献调研法回顾国内外相关研究现状和进展，然后阐述本文的选题背景、研究意义、研究内容、研究思路、研究方法和创新点，接着对本文所涉及到的数字人文、社会网络分析、本体等理论与相关概念进行了阐述。之后，第三章从《胡适中文书信集》中提取人物实体，构建人物关系共现图谱，运用社会网络分析方法，分析网络的结构特征、节点的中心性并进行群体分析，深度揭示胡适的人物关系网络；第四章从《胡适中文书信集》中提取地点实体，利用QGIS绘制胡适的行动路线图谱，并结合历史背景和其他史料，分析胡适行动轨迹的特点和形成原因，同时运用标准差椭圆和核密度估计等空间分析方法，探索胡适行动轨迹的空间分布和活动范围；第五章则尝试将提取出的人物、人物关系、人物成果、书籍、事件等要素，基于本体理论构建本体模型和知识图谱，为构建以胡适为中心的语义化知识数据库奠定基础。在完成上述内容的分析后，在最后一章对如何较为全面地挖掘书信资源内容、分析某一人物个体得出了方法路线总结和构建，并在此基础上，对已有的与胡适相关的研究内容进行了补充和完善。最后，本文总结了本研究的主要发现和启示，并指出了存在的不足和改进的方向。

Today's society is during a new wave of digitalization, and the digital humanities are experiencing unprecedented development. In the process of interdisciplinary integration and innovation, the traditional paradigm of humanities research has been strongly promoted by digital technology, which has expanded the depth and breadth of humanities research from a broader perspective and more diverse dimensions, and endowed it with new vitality. Among the information resources, as an important part of historical documents, letters have irreplaceable value and significance. The Republic of China is a key historical node of political reshaping, economic transformation, and ideological agitation, during this time, many forward-looking scholars and intellectuals with outstanding talents have emerged. In the era when modern means of communication, such as the telegraph, were not yet widespread, letters became their main communication way, which can record their life, work, and emotion. Among these scholars of the Republic of China, Hu Shih, with his diverse social circles, his great ability for making friends, and his good habit of collecting letters throughout his life, made his letters very abundant and completely preserved. Thus, the posterity devoted themselves to collecting, collating, researching, and publishing Hu Shih's letters.

Taking Hu Shih's Chinese Letters as the research object, this paper reviews the current status and progress of relevant research at home and abroad by using the literature research method, and then expounds the background, research significance, research content, research thought, research methods and innovation points of this paper, and then expounds the theories and related concepts of digital humanities, social network analysis, ontology and other theories involved in this paper. In this paper , the third chapter extracts character entities from the Hu Shih’s Chinese Letters, constructs the co-occurrence map of relationships, uses social network analysis methods to analyze the structural characteristics of the network, the centrality of nodes and conducts group analysis, which deeply reveals Hu Shih's relationship network. The primary focus of the fourth chapter is to identify and extract the geographical entities mentioned in the Hu Shih’s Chinese Letters. At the same time, using standard deviation ellipse and kernel density estimation to analyze the spatial distribution and range of Hu Shih's trajectory. Based on ontology theory, The fifth chapter tries to construct ontology model and knowledge graph with the extracted elements such as characters, relationships between characters, achievements of characters, books and events, which lays the foundation for the construction of semantic knowledge database of Hu Shih. After the analysis of the above content, the last chapter summarizes and constructs the method of how to mine the content of the letter resources and analyze an individual character in a more comprehensive way. At the same time, the existing research on Hu Shih is supplemented. Finally, the paper concludes by summarizing the key findings and implications of the study, as well as identifying areas for improvement.