1, child development psychology, a branch of psychology. This paper studies the psychological development of human individuals in childhood (from birth to maturity), and reveals the general law of children's psychological development and the psychological characteristics of children of all ages. Children's age stages are usually divided into: lactation (from birth to 1 year), infancy (from 1 to 3 years old), infancy (from 3 years old to 67 years old), childhood (from 6 to 11 years old), adolescence (from 12 to 14 years old) and early youth (from 14 to 17 years old). Pryor, a German physiologist and experimental psychologist, published the book "Child Psychology" in 1882, which is the first book to study child psychology by systematic observation and experiment, and is the symbol of its birth.

2. The research object of educational psychology, the characteristics of physical and mental development of primary school children, and the relationship between education and development. The educational psychology of primary school children is a subject that studies the basic psychological laws of teaching and learning in the teaching situation of primary school education. That is, to study the psychological process of teacher-student interaction in the teaching situation of primary school children and the psychological phenomenon in the psychological process of teaching and learning.