The special theory of relativity is a theory developed by albert einstein regarding the relativity of space and time. This study aims to determine the response of high school students to solving relativistic energy problems using the Pythagoras method. Phitagoras method is a survey research with 28 students in the class XI MIPA 1 SMA Muhammadiyah 3 Jember in the 2021/2022 academic year. This research is a development research from previous researchers. The sampling technique in this research is using saturated sampling using student response questionnaires. The questionnaire used using the Likert scale refers to three student responses, namely cognitive, affective and conative. Based on the results of the study obtained a positive influence on the completion of relativistic energy with the phytagoras method with the percentage of cognitive dimensions of 71.11%, affective of 69.03% and conative of 70.75%. Overall, students gave a response of 70.29% which is included in the strong category.