This research on the development of environment-based science teaching modules aims to: 1) to analyze the results of the validity of the content of science teaching module based on environment which meet valid criteria, 2) to analyze practitioners' assessments of environment-based science teaching modules, 3) to analyze the effectiveness of cience teaching module based on environment. The test subjects for this research were 23 class VIII students at MTsN Barru. The research method with 4D model. The instruments used in this research were validation sheets, practitioner assessment questionnaires, and test instruments for students' science learning outcomes. The practicality criteria are seen from practitioners' assessments of the teaching modules, and the effectiveness criteria are seen from the average percentage gain score increasing students' science learning outcomes. Based on the results of the analysis, the following conclusions were obtained: (1) the science teaching module based on environment developed based on expert assessment using Aiken's V index analysis was declared valid and suitable for use with minor revisions; (2) the science teaching module based on environment in terms of teacher responses is in the very good category; (3) the effectiveness of the science teaching module based on environment, which was analyzed using N-gain, obtained an average value of 0.56, which is in the medium category with a percentage of 56.46%, which means that there is an increase in students' science learning outcomes so it can be said that The science teaching module based on environment developed is effective and can improve students' science learning outcomes.