This paper, divided into six sections, is based on Dewey's only study of the subject matter of history, literature, science, and art in his lifetime, supplemented by Dewey's other related writings. It first describes Dewey's ideas about the value of subject matter for the four studies, the general considerations for the organization of subject matter, and the main points of the organization of subject matter for each stage of education. On the basis of this, two confirmations are made: firstly, Dewey's view that the value of each studies' subject matter is based on whether they are conducive to the establishment of students' social or life consciousness; secondly, Dewey has always advocated the unification of each studies' subject matter, and thus has always opposed to the dichotomy between each studies' subject matter and the human's past, present, and future life.