The aim of this paper is to investigte the diffusion of innova-tion theory in the field of education. To do this, we considered the com-prehensive definition of diffusion of innovation theory by focusing on its four essential elements (innovation, communication channels, time, social system). Then, the necessary requirements for spreading innovations (rela-tive advantage, relative compatibility, ease of use, testability, observabil-ity), and the people who involved in this matter (innovators, early adopters, early majority, late majority, sceptics) were examined. Then, the impact of innovations on the most important factors of education system (schools, human elements particularly teachers, educational materials and teaching-learning methods) has been addressed. Finally, some suggestions for en-couraging and accepting educational innovations have been offered.