1. A famous German educator, Froebel, whose main works are "Human Education" and "Mothers and Children's Songs". Froebel is the founder of kindergarten in the modern sense and the first person in the history of education to admit the educational value of games and systematically bring game activities into the educational process. Froebel put forward the concept of "kindness", that is, toys and materials used by kindergartens to play games and do homework.

2. Italian female educator Montessori, whose masterpieces include Montessori's Educational Methods, The Secret of Childhood, The Absorbed Mind, etc. 1907, Montessori opened a kindergarten named "Children's Home" for poor children aged 3-7 in the slums of Rome; She founded the Montessori teaching method, in which four elements are children, teachers, environment and teaching AIDS, and the course contents include sensory education, language education, discipline education, introductory mathematics education and daily life education; She put forward the related contents of children's psychological development view, namely, psychological embryonic period, psychological absorption period, sensitive period and so on; Sensory training is the main content and the most distinctive part of Montessori education. Tactile training is the most important aspect of Montessori's sensory training, which follows the principle of gradual progress and self-education. In Montessori's view, teachers mainly play the role of provider, demonstrator, observer, supporter and resource of environment.

3. Dewey, a famous modern American educator, is an important representative of child-centrism in the first half of the 20th century. He also put forward his own unique view of children's education: education is growth, education is life, and education is the constant transformation of experience. Task courses and teaching materials are based on children's current life experience, and children's own activities are both courses and teaching materials.