李大钊是中国最早的马克思主义者,是近代中国先进知识分子的杰出代表。在其短暂的生涯中,辛亥革命到五四运动时期是他思想发展的关键时期。这一时期,他不仅从思想上,而且从行动上完成了由激进民主主义者向马克思主义者转变,成为中国近代史上第一个完成这种转变的人。本文试图通过对辛亥革命时期李大钊强烈的爱国民主革命思想;新文化运动时期激进的民主革命思想;五四运动时期的马克思主义思想的论述,揭示出其思想的内在轨迹。 Li Dazhao was the earliest Marxist in China and an outstanding representative of modern Chinese advanced intellectuals. During his brief career, the revolution from 1911 to the May 4th Movement was a crucial period for his thought development. During this period, he not only completed his ideological but also action-oriented transformation from radical democrats to Marxists and became the first person in the modern Chinese history to complete such a transformation. This article tries to reveal the intrinsic path of Li Dazhao’s thought of patriotic and democratic revolution during the Revolution of 1911, the radical democratic revolutionary thought during the New Culture Movement and the Marxist thought during the May 4th Movement.