The paradigm of science learning has now shifted. Science learning should be concrete and contextual, so efforts are needed to improve student learning outcomes. Efforts can be made by applying a learning model that involves students actively in building their knowledge concepts, namely the Scientific Approach. The use of Scientific Approach learning model can be combined with the help of 3-dimensional diorama media. This study aims to improve students' science learning outcomes by applying the Scientific Approach assisted by 3-dimensional diorama media. This class action research was conducted in two cycles on 25 fifth grade students of SDN 1 Siman Ponorogo. The results showed that there was a significant increase in the value of science learning outcomes, namely students with completed categories above the KKM in the pre-cycle 8 people or 32%, cycle I 19 people or 76%, and cycle II 23 people or 92%. Progress in student activity is also increasingly experiencing positive progress. This shows that students are very enthusiastic in participating in learning, so that the average results of student activity in each activity are Cycle I 81.87% and Cycle II 8.22%.