Marx’s Classic Statement is not a brief condensation of his historical theory, but a developmental law about capitalist society derived from his analysis to the production process of capitalist society with his general understanding of human history in his early days. Beginning from analyzing human nature and his mode of existence, Marx constructed the system of theories centered around the development of human itself, and tried to analyze each phase of human development in reality, thus developing a multi-dimensional, multi-level interpretation to human history. Therefore, Marx’s philosophy of history is speculative, analytical and critical. The Preface is just the paradigm of this kind analysis.