《李大钊北京十年（思想篇）》介绍李大钊在北京十年（1916-1927年）间所论说过的思想观点，对他的国家学说、解决中国问题的途径、少年中国说、社会主义理论、创建中国共产党的论述，以及哲学、史学、政治学、经济学、图书馆学等方面理论建设进行论说回顾和理论探讨，汇总他多方面深邃的思想论述，介绍国内外学者各具特色的解读，力求全面展示李大钊学术思想的精华。"思想篇"和"交往篇"、"事件篇"一起，阐述了李大钊在北京十年的作为，期望有助于广大读者感受李大钊光辉的革命思想和巨大的人格力量，有助于全社会深入学习、研究和宣传李大钊宝贵的思想遗产。（This book introduces the views which Li Dazhao expressed during his living in Beijing (1916-1927). It provides Li's exposition of theory of state, the solution to China problems, the young Chinese said, socialist theory and the creation of CPC, reviews and theoretically discusses his argumentation of theory building in the areas of philosophy, history, politics, economics, library science, etc. It also summarizes his profound idea exposition in multiple respects, offers the distinctive interpretation of scholars at home and abroad to comprehensively show the essence of Li's academic ideas. The "thought part", "intercourse part" and "event part" combine to describe Li's deeds in Beijing in this period. We expect these three books to help readers to feel the brilliant revolutionary ideas and great power of personality, help the society to deeply learn, study and publicize Li's precious ideological heritage.）