A Journal of the Plague Year is the example for the fiction/authenticity writing. Daniel Defoe was engaged in the imagination on the basis of the related facts gathered from historical literature, statistics, etc., with the purpose of representing the whole picture of society stranded in the London Plague of 1665. His writing consists of multiple projections, namely, the projection of historical truth in the fictional narrative, the projection of collective imagination in the real life, the projection of personal understanding in public consensus, and the projection of social publicness in personal subjectivity, which are the concrete representations of the concerned multiple relationships. Thus, the authenticity writing of this book is integrated into the interactive construction between fiction and authenticity, personal subjectivity and social publicness.