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Science and technology advances provide space for teachers to be able to create a variety of learning media that can be used in the learning process This study is aimes to determined the process of implementation of learning and improvement of students learning critical thingking with video technology media based on heat and temperature at class XI MIPA of MAN Serdang Bedagai. Video technology media based on heat temperature is a form of learning media that can accommodate student learning needs in accordance with the critical thingking of students. The method is quasi experimental type of research while subject of this research are students of class XI MIPA 1 dan XI MIPA 2 academic year 2019 / 2020 which consist of 60 students. Data collection techniques is test with the instrument of written test of essay that consist of 15 questions. The stages in this research are preliminary study, video design, research implementation and conclusions.