The keypoint of this investigation is how to systematize the educational materials as a educational science. The writer of this paper made clear of the difinition, classification, construction and the method of study on the educational matenals. By introducing the method of science into our material investigations, the writer classified the educational materials in science education into the following four groups ; 1) Observational Materials 2) Hypothetical Materials 3) Experimental Materials and 4) these Complexes, and, the principles of the organization for these materials were also systematically discussed from the wide point of view of the education and natual science. Especially, in construction of material for science education, the writer pointed out the methodological linkage of psicology and logics in the process of learning science.