Use of Experiment Method in Improving Natural Science About Charateristic Light on IV Grede Student in SDN Lemujut. This research   is   describe the step of the experimental method in  learning about, to describe the behavior of students in the following subjects, and to improve result learning with experimental method. This study uses classroom action research and conducted in three cycles, each include the planning, implementation, observation and reflection. The result showed that the application of the experimental method in natural science improved  learning, the behavior of students in the following subjects, as well as student learning result.