The background of this research is the low learning outcomes of students in science subjects because of inaccuracies in the learning model used by teachers in the learning process. Teachers are still a source of information, learning, teacher-centered and teacher fixed in textbooks so that students are not active in learning. Action research method uses observation and tests. Subjects were fourth grade students SDS Bahreisy Surabaya. With the number of students 27 children, 15 male students and 12 female students study underway in SDS Bahreisy Surabaya. Data gathered through the research instrument, research instrument used include observation and tests. To measure the activities of teachers and students to use observation activities for students while using an evaluation tool in the form of a test. Data analysis techniques for observation and tests using quantitative techniques. Activities of teachers has increased from the first cycle with a percentage 65.4%, in the second cycle with a percentage 89.3%. Activities of students during the learning process show an increase in the first cycle with a percentage of 66.8% and a second cycle with a percentage 87.3%. Classical completeness students in the first cycle of 70.4% and 93.3% for the second cycle. This study concluded that the implementation of learning model type STAD cooperative learning model to improve teacher activity, student activity and student learning outcomes.