First of all, in terms of political system, city-state system. It is characterized by small country, few people, autonomy, cultural identity, political democracy, developed commodity economy and prosperous ideology and culture.

Secondly, ancient Greece was surrounded by the sea and mountainous, and there was a serious shortage of cultivated land resources. Therefore, the development of commercial economy has attracted more attention. It needs a relatively free social environment and promotes people's pursuit of equality and freedom.

Thirdly, due to the lack of arable land in the surrounding waters, the ancient Greek people actively carried out commodity trade and colonial expansion, and developed a national character of being brave in exploration and pursuing freedom.

Finally, a small country with few people, city-state system and the king's rights are limited by local governors, which is not very strong. Therefore, the development of democracy has the most basic environment.