As one of Joseph Conrad’s representative works,Heart of Darkness exposes the dark side of Belgian colonization while exploring the darkness that Marlow encounters.This darkness of human heart leaves such an impressive and thought-provoking imprint in mind that readers’often find it hard to let the feeling go.To achieve this extended impression,double narrative structure and indirect language is employed in Conrad’s writing. As one of Joseph Conrad’s representative works, Heart of Darkness exposes the dark side of Belgian colonization while exploring the darkness that Marlow encounters. This darkness of human heart leaves such an impressive and thought-provoking imprint in mind that readers’ often find it hard to let the feeling go.To achieve this extended impression, double narrative structure and indirect language is employed in Conrad’s writing.