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The scenario of 21st century relies heavily on the computer and digital system. Many scholars argued that it is important to implement and evolve the integration of science, technology, engineering and mathematics (STEM) in school system which will give direct advantages for students, teachers and educational institutions. Therefore, this study is aimed to examine the enhancement of student-s STEM literacy on knowledge aspect after implementing STEM based module in learning earth-s structure and its dynamics topic. The method of this study is weak experiment pretest posttest one group only. The subject of this research is one class of 7th grade students that consist of 39 students in one junior high school in Bandung, Indonesia. Developed STEM based module on earth-s structure and its dynamics topic is delivered to students in their learning activity. Moreover, to measure students- knowledge enhancement of STEM literacy, a pre-test and a post-test were given to students which consist of 20 multiple choice questions. Specifically, there are 11 questions of science literacy, four questions of technology-engineering literacy and five questions of mathematics literacy. Student-s pre-test and post-test result is analysed by calculating normalized gain and its effect size. The results of this research showed that students- science literacy enhanced satisfactory (n-gain = 0,35) with 1,10 of effect size (strong effect), technology-engineering literacy shows the highest enhancement of (n-gain = 0,56) means that it also enhanced satisfactory with effect size score is 1,24 (strong effect), and mathematics literacy is the lowest enhancement of (n-gain = 0,32) and is categorized as satisfactory enhancement with effect size of 1,13 (strong effect). To sum up, student-s STEM literacy enhanced satisfactory with strong effect size after the implementation of STEM based module in their learning activity.