This research intends to develop the teaching material macromedia flash based as the solution of the low understanding of science concept. This research examines the advantages and disadvantages of teaching material based on the responses of several sources who are lectures, university students, teachers, and students. Teaching material of science is expected to be used by teachers, lectures, and students and also related parties. The teaching material macromedia flash of science was specially designed to reduce the low understanding of science concept. Method used is developmental research. The result of students’ average score achieved based on the identification through science diagnostic test revealed that in category of guessing answer the percentage is 4.65%, correct answer is 18.14%, lack of material understanding is 22.17%, and miss concept is 55.04%. This research was conducted to identify the miss concept in science based on diagnostic test. The result of limited test in some school revealed that the average of students’ score in category of guessing the answer is 2.74%, correct answer is 76.02%, lack of material understanding is 10.89%, and miss concept is 10.35%. Therefore, it can be concluded that there is a reduction in the error rate concept of science after using teaching material macromedia flash based.
Keywords: concept understanding, science teaching material, macromedia flash