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Understanding the concept of physics can be influenced by methods used in the learning process. With the cooperative method of type STAD and mapping concept can be seen the level of understanding of physics concept. Both methods are applied to the physics learning process in SMA Negeri 2 Padangsidimpuan class XI semester 2. This test was conducted on two classes with a total of 64 students. This class is divided into control classes and experimental classes. Samples were taken using purposive sampling. From sampling it can be seen that the average pretest on the experimental class is 71.9 and posttets 77.8. So that the average understanding of students who are given an inkuri treatment method is 28.38%. While the average pretets on the control class 65.8 and posttets 72.19. The average increase in the learning outcomes of students given an expository method is 15.02%. Based on test calculation result of tCount > tTable, or > 1.677. This means Ha is acceptable, that is, there is a cooperative influence of the STAD type to understand the physics concept of students.