Plato, an ancient Greek philosopher, systematically expounded preschool education for the first time in the history of western education. In the Republic, he put forward the view that children should be taken care of by the public. He believes that before the age of three, maids are responsible for food and drink, and education is supervised by the best citizens of the country. Children aged 3-6 are concentrated in the children's playground of the temple. Citizens are appointed by the state to supervise and educate, and maids are responsible for eating and drinking. The contents of education mainly include telling stories, playing games and learning music.