"Cradle of Western Civilization" mainly refers to the representative of ancient Greek civilization-democracy represented by Athens. Because we know that the political system implemented in western countries now is a bourgeois representative political system with the separation of powers as the basic principle, and the human rights thought with "democracy" and "freedom" as the core is the guiding ideology of western countries. In ancient Greek civilization, in addition to democracy in Athens, there was oligarchy represented by Sparta (that is, power was concentrated in the hands of a few people). Obviously, oligarchy cannot be the cradle of western civilization. Under the above premise, the characteristics of the ancient Greek political system as the cradle of western civilization can be summarized as eight words, namely, "citizen sovereignty, taking turns to govern."