Abstract: Alias Grace is one of Margaret Atwood's representative novels. This article tries to explore the techniques of post-modern historical writing that Atwood uses, multi-layer narrative structure and intertextuality, and fictionality and indeterminacy of the plot. In this novel, Atwood exposes the life experience of women and social reality of the oppressed, thus intending to let the silenced and marginalized women have the chance to articulate their voices. Drawing on historical facts, Atwood reassesses her deep concern of women's fate, her doubt of the official history, thereby offering her reflections on the authenticity of history.