Answer: (1) Relevant content. ① Criticize the traditional curriculum. Dewey strongly opposes the existing knowledge-centered curriculum and textbooks used in traditional education. He thinks that traditional courses are extremely poor in intellectual education, and textbooks are full of boring things. Dewey pointed out that it is "against children's nature" to impose those "prepared textbooks" on children, and various subject courses will only split and dismember children's unified and complete life experience, thus hindering their growth. ② Psychology textbooks. He believes that teaching materials should be related to children's energy experience. According to these principles, he proposed that "teaching materials should be psychology-oriented". The knowledge acquired by children should conform to their psychological level, and various forms of activity homework should occupy a central position in the curriculum, so that children can learn by doing. ③ Learn by doing. For teaching and curriculum, Dewey's basic principle is "learning by doing", which runs through the teaching process, teaching methods, curriculum, teaching organization and other aspects. Dewey believes that students should be provided with a "well-equipped environment" so that students can learn by doing and gain experience by doing, so as to master knowledge and develop their thinking ability. (2) Practical significance. Dewey recognized the weakness of traditional curriculum and advocated attaching importance to the accumulation of children's direct experience. The compilation of teaching materials should pay more attention to students' psychological level. Textbook psychology further combines pedagogy and psychology, making our curriculum more scientific. At the same time, Dewey's emphasis on learning by doing is also an inspiration and progress to traditional sit-in learning, which is consistent with the concepts of "comprehensive practical activities" and "group cooperative learning" advocated in the new curriculum reform in China. However, Dewey denied all traditional subject courses and was only satisfied with activity courses and personal experience, which was unscientific and eventually led to the backwardness of American education quality. Therefore, in the actual course writing process, we should combine the knowledge logic and psychological logic of teaching materials. In actual teaching activities, we should give priority to subject courses, ensure students to learn systematic and scientific cultural knowledge, improve teaching efficiency, and cultivate students' creativity and practical ability with the help of activity courses.