This development research is aimed to evaluate the validity, practicality, and effectiveness of the integrated science concept module that has been developed to practice the critical thinking skill of the eighth-grade students in the odd Semester. The subject of the research are the the eighth-grade students of MTs Al Azhar Barito Kuala. This research is conducted in the academic year 2019/2020. The data of module validity is gained through the assessment of 3 experts. The data of module practicality includes the assessment of module implementation and students' responses on small group test. The data about module's effectiveness is gained from; 1) the result of students' critical thinking, 2) the result of cognitif students' assesment and 3) students' response on the learning activities and the practice in the field test. Data of the research were collected through test and observation and then were analyzed descriptively. The results of the research showed that the integrated science module to practice the students' critical thinking skills could be stated to be valid in all aspects, including design, format, material, language, presentation, supporting innovation of the module and the improvement of teaching learning activities. The module was also considered practical because it was easy to be used by the students. These can be seen from 1) the implementation in the small group test that obtained scores of 91,67% for module 1 and 94,44% for module 2 and 2) positive response from students toward learning process. The effectiveness of the science module was also fulfilled. This was based on the findings in the research i.e: 1) the average of students' critical thinking skills on small group test reaches a good category (3≤4), 2) students' critical thinking skills on the field test which at least reaches a good category (3≤4), and 3) cognitif assesment results gained through the field test was in a good category (80≤100%).