唯物史观是无产阶级政党的理论基础和科学世界观，也是历史科学乃至哲学社会科学的理论武器和研究指南。１８８３年，恩格斯在马克思墓前论述马克思主义的两大发现（唯物史观和剩余价值学说）时强调：“这个人的逝世，对于欧美战斗的无产阶级，对于历史科学，都是不可估量的损 Historical materialism is the theoretical foundation and scientific world outlook of the proletarian political parties and is also the theoretical weapon and research guide of historical science and even philosophy and social science. In 1883, when Engels elaborated Marxist two big discoveries (historical materialism and surplus value theory) in Marx’s tomb, he stressed: "The death of this man is inestimable for the proletariat fighting for Europe and the United States and for history and science