Abstract: Through an interpretation of the text and the related quasi-texts, such as the preface, letters and journals in Ryunosuke Akutagawa's The Journal in Beijing, this paper tries to explore the text generation in the book and the space fantasy that the city of Beijing brought to the author. An investigation into the text generation helps us understand the connotation and extension of the text, and reveals the importance of Beijing in modern times on Akutagawa's career from a different perspective, which will in turn shed new light in the understanding of the interaction between China in modern times and the author, and of Akutagawa's views on China in modern times.