Considering the importance of the experimental science course in schools, and the findings of the international evaluation of the status of Iranian students in science, it is necessary that the Ministry of Education utilizes all possible tools for the students' advancement in science and technology and maximizes the investment in this area. In recent years learning theories have brought about a significant change in science education, especially by mixing in new technologies. In this article, the findings of a research project on the effects of multimedia method of teaching science on students' learning are discussed. The foundations of this method are the constructivist theory of learning, computer technology, and the cooperative learning strategy. In the process of utilizing this method, the students are active in producing knowledge through cooperation with each other and utilization of computer as the medium of knowledge construction. Findings show that students who learned science using the multimedia approach had higher achievement than those who utilized the traditional method.