The study aims to develop interactive learning media using Adobe Flash Professional CS6 software on Earth and Universe materials for third-grader students in primary school. The types of the study are research and development which carried out by using Borg and Gall's model development and modified into 7 development steps, which are (1) research and information collecting; (2) planning; (3) develop preliminary form of product; (4) preliminary field testing; (5) main product revision; (6) main field testing; and (7) operasional product revision. The study was conducted on April 2018 in two primary schools in Salatiga. The subjects of the study involved 10 third-grader students of primary school on preliminary field testing and 32 third-grader students of primary school on the main field testing. The results of validity test from the media expert obtained an average scores of 3,9 with a good category. The results of validity test from the material expert obtained average scores of 2.95 with good enough category. The result of students questionnaire on preliminary field testing showed the average scores of 4.5 and the result of the students questionnaire on main field testing showed the average scores of 4,6 with a very good category. Then, the result of teachers questionnaire showed an average of 5.0 on preliminary field testing and 4.8 on main field testing with a very excellent category. Based on the validation of material experts, media experts, the results of questionnaire responses of both students and teachers, interactive learning media that developed by adobe flash software of earth and the universe materials are suitable in learning for third grader of Primary School students and can enhance students' interest in learning materials and build students' learning motivation.