An understanding of a scientific concept and process is needed in everyday life. This ability can be achieved by entering components of scientific literacy indicators in learning. Unfortunately, teaching tools that can be used to improve scientific literacy skills are still uncommon. This research focuses on developing and implementing STEM-based teaching materials to improve students' scientific literacy skills in static fluid material. The development design uses a 4D model (define, design, develop, and disseminate). After the product is validated by experts using a questionnaire, the effectiveness is tested with the one group Pre-Posttest design. These research participants were 34 eleventh grade high school students in Malang City. The scientific literacy ability test instrument has a reliability of 0.741. Data analysis was done with Wilcoxon signed rank test and N-gain. The result shows the teaching material was valid with the score of 89.5% and the difference in pre-posttest scores with medium improvement category indicated by the score of N-gain is 0.65. In other words, it can be said that STEM-based teaching materials of static fluid are very good to use and improve student's science literacy skills. For future research, there is room to broaden the scope of teaching materials for other materials with STEM integrated PjBL to enrich the students with better scientific literacy skills. © 2020 Author(s).
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