It was easy to teach 20 people in one class in the early days. There are about 10 to 15 children in a class of early education institutions with good conditions, which belongs to small class teaching, ensuring that every child in early education classes can be taken care of. The upper limit of early education class is 20, and the upper limit of large class is 30. Moreover, early education is the enlightenment of children, and no formal study is needed to test the effect of early education, so the early education class of 20 people is very easy to teach.