本论文试图从“新文学的建设者”这一角度对郑振铎的新文学思想及其文学实践进行考察，以郑振铎的新文学思想为中心，串联起他一生中主要的文学实践活动，分析在这种新文学思想影响下的各种具体的文学实践，揭示出郑振铎为建设新文学所做出的独特贡献，以此更准确、更深刻地认识郑振铎在文学史上的地位和意义。绪论部分主要论述郑振铎是新文学的一位积极的“建设者”。郑振铎的新文学思想以“建设”为核心，在这种思想影响之下，郑振铎所有的文学实践最终都指向“新文学的建设”。从“新文学的建设者”这一角度来考察郑振铎在文学史上的地位，这是一个具有重要学术价值的课题。第一章介绍郑振铎新文学思想的主要内涵。从内涵来看，郑振铎的新文学思想主要有三方面：第一，对新文学性质的独特阐释；第二，对新文学使命的深入探索；第三，对新文学基础的积极建构。第二章从文学创作的实践来分析郑振铎的新文学思想对其创作的影响。郑振铎的文学作品几乎都兼具两种倾向：对于“情绪自我”的塑造和对于“现实改造”的关注，因此表现为“情绪自我”和“现实改造”交融的双重文学世界。第三章考察郑振铎的新文学思想在他的文学刊物编辑活动中的体现。郑振铎所主编或参与编辑的文学刊物都鲜明地表现出了三种倾向：对于外国文学理论的介绍与传播、对于“国故”的整理、对于新文学作家作品的积极推出。可以说，郑振铎编辑文学刊物的过程，也是他在建设新文学的过程。第四章分析了郑振铎的新文学思想对其文学研究的影响。本章主要考察郑振铎的《俄国文学史略》、《文学大纲》、《插图本中国文学史》、《中国俗文学史》这几部重要的文学史著作，并分析它们是如何体现郑振铎的新文学思想的。第五章介绍和分析郑振铎在儿童文学和文学翻译这两个方面的思想与实践活动。郑振铎的儿童文学思想和文学翻译思想是他的新文学思想在儿童文学和文学翻译领域内的延伸，郑振铎在儿童文学和文学翻译里的实践活动也是他建设新文学的两个重要的努力方向。结语部分总结郑振铎作为新文学的一位积极的建设者，以他的新文学思想和文学实践活动为新文学的发展做出了巨大的努力，为丰富新文学的面貌做出了重要的贡献。

From the angle of “the builder of the new literature”, the dissertation tries to review Zheng Zhenduo’s new literature thoughts and practice. The center of the dissertation is Zheng Zhenduo’s new literature thoughts, and then to analyse how the thoughts impacts his practice, to reveal Zheng Zhenduo’s contribution to the new literature， and to deeply understand Zheng Zhenduo’s status and significance in the history of literature.The exordium tells that Zheng Zhenduo was an actively “Builder” of the new literature. The core of Zheng Zhenduo’s new literature thoughts is“Building”. From the angle of “Builder” to analyse Zheng Zhenduo’s literary status is a problem which has important learning merit. The first chapter introduces the content of Zheng Zhenduo’s new literature thoughts. The thoughts contain three aspects: Firstly, explaining the character of the new literature; Secondly, exploring the mission of new literature; Thirdly, building the base of the new literature. The second chapter analysis the relationship between Zheng Zhenduo’s new literature thoughts and his literary creation.There are two trends in Zheng Zhenduo’s literary creation: keep an eye on the realism and pay attention to human emotion.The third chapter tells the relationship between Zheng Zhenduo’s new literature thoughts and his edit practice. In the course of editing, Zheng Zhenduo had done much to build the new literature.The fourth chapter tells Zheng Zhenduo’s achievement in literary research. This part reveals some Zheng Zhenduo’s literary history book, and tell how his thoughts impact his research.The fifth chapter tells Zheng Zhenduo’s practice on the children literature and the literary interpretation. Both of the two sides aimed at the building of the new literature.The conclusion tells that the core of Zheng Zhenduo’s new literature thoughts is how to build the new literature. As an active builder of the new literature, Zheng Zhenduo had done much to the new literature.