柏拉图政治思想的变化经历了由“人治”向“法治”的转变,他的理念论也经历了由“一元唯善论”向“多元范畴论”的转变。这两个转变具有一致性,都是在他去西西里参政失败之后发生的。西西里参政失败是柏拉图思想发展的转折点,使他在思想整体上由“理想性”向“现实性”转变。这也是马克思实践思维方式在古希腊思想中的先声。 The change of Plato’s political thought has undergone a change from “rule of man” to “rule of law,” and his theory of ideas has also undergone a transformation from “one-dollar mere theory of truth” to “multiple-category theory.” The two changes are consistent, both after he failed to participate in the political participation in Sicily. The failure of political participation in Sicily is a turning point in the development of Plato’s thought, which makes him change from “ideal” to “reality” in the whole thought. This is also the forerunner of Marx’s practical mode of thinking in ancient Greek thought.