马克思主义在其发展中运用了几种科学的抽象方法，一是在创立唯物史观时运用了主要矛盾分析方法；二是在经济领域进行了纯形式的抽象法；三是先弃后入法可看作是对纯形式法的补充和修正；四是运用溯源法找到商品这一逻辑起点。 Marxism used several scientific abstraction methods in its development. One was to apply the main contradiction analysis method when establishing the historical materialism, the other was to abstract the pure form in the economic field, and the third was to abandon the post-admission law It can be regarded as a supplement and amendment to the pure form method. Fourthly, the logical starting point for finding commodities is traceability.