Abstract: The famous novel King Solomon's Mines written by the British novelist Haggard was introduced by Lin Shu to the late Qing Dynasty in 1908, its themes of valour and vigour exerting a great influence on the construction of youths' spirit then. Within the theoretical framework of "discourse construction-textual construction-construction of subject consciousness" proposed by the Theory of Rhetoric in the Broad Sense, this thesis conducts a close reading of the original text and the translated text, analyzes the rhetorical key words of "youth" and "bravery", explores the rhetorical devices employed by Lin Shu to construct juvenile valour discourse within the specific historical context of the Late Qing Dynasty, and finally expounds from such aspects as the historical context and the translator's subjectivity the cultural factors, the most important of which is that youths have suddenly become the center of revolution discourse and thus a metonymy of national image.