Goals of this study to determine effect of applying physics websites based on STEM assisted of Google Sites to advance student’s creative thinking skills for momentum and impulse materials. Method in this research is R&D by using ADDIE Models, and for experimental using one group research design pretest-posttest design. Collecting data technique are questionnaire and instrument test (pretest and posttest). The Data was obtained in SMA Negeri 1 Berau, with the respondent in this study 32 students from X MIPA 1, data analyzed by Software IBM SPSS Statistics 25 for Descriptive statistics, Sign Test and Reliability test. The research results showed that the instrument which have been developed was reliable. the results obtained that the website developed is practical for learning. The treatment given is able to advance students' creative thinking skills, which showed from the high average post-test score compared to the pre-test. The Profile Student’s creative thinking skills each indicator showing that for indicator originality, flexibility, and elaboration has increase, but there is no difference value for indicator fluency
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