The purpose of this research is to improve the learning outcomes of Elementary School (ES) students through the implementation of Children Learning in Science (CLIS) in grade V SDN 1 Sudimampir Regency West Bandung (KBB). The research design was conducted using experimental research design. The study population is 60 students divided into two classes. Data collection techniques used include: tests, observations, questionnaires, and documentation. Data analysis techniques used were prerequisite analysis test consisting of: normality test, homogeneity, and final analysis using t-test. Based on the results of hypothesis test data learners learn that the value of t count of 2.941 and t table of 1.677 (t count > t table), so Ho rejected. Thus, it can be concluded that the application of CLIS proved effective against the learners' learning outcomes in science learning material changes in the properties of objects.