Lot of scholars to study "The Dream of the Red Chamber"(《紅樓夢》)from a Buddhist viewpoint, but most of them ignore the importance of "stone"(頑石) and "magic jade"(通靈寶玉)—two very important symbols in Buddhism. This article is based on the Theory of "One Mind and Two Gates"(一心開二門), and to prove "stone" and "magic jade" symbolize "delusory mind"(妄心) and "pure mind"(真心). This paper also expounds the variation and the relation between two symbols. Thus, the purpose of this paper is to interpret this book with a new viewpoint.