This study aims to describe the effectiveness of the discovery learning model with a scientific approach to the science learning of temperature and heat matter. Discovery learning model is a learning model that aims to train students in finding the concept independently in solving problems. This research uses one group pretest-posttest design. The subjects of the study included three classes of students of SMP Negeri 1 Krian class VII-C, VII-D, and VII-E on the second semester of the academic year 2017/2018. Data collection used observation, test, and questionnaire methods. Instruments used include the test results of learning as much as 20 items. The effectiveness of learning is evaluated from the value of N-Gain class VII-C of 0.77, class VII-D of 0.75, and class VII-E of 0.75 each grade obtained high N-Gain value, t-pair paired statistics of the three classes, affective and psychomotor learning outcomes calculated percentage achievement.Student's response to learning by using the discovery learning method with scientific approachis very positive,that is 94,85% responded well 5.15% responded less well. Based on the findings in this study, it is concluded that the students' learning outcomes in both cognitive, affective, and psychomotor aspects have improved by using discovery learning with scientific approach on temperature and heat matter.