A: (1) Pestalozzi's teaching psychology thought is mainly realized through his method system of factor education theory. In the later practice of primary education, Pestalozzi attached great importance to the study of simplifying primary education methods. (2) In Pestalozzi's view, elements are the simplest basic units that constitute things. Factor education is a method system to seek the simplest elements of teaching content according to the initial performance of children's innate ability. (3) The most complex sensory impression is based on children's simple elements of the surrounding objects. When you make the simple elements completely clear, the most complex sensory impression becomes simple. Pestalozzi firmly believes that the most basic and simple elements are the indispensable foundation of all kinds of education.