This action research investigated wether the directed cooperative learning on the topic of gas kinetic theory chould (1) activate student learning process (2) improve students interest in studying the kinetic theory and (3) improve students understanding on the gas kinetic theory. The sample or the research was 30 students of physics education who were studying gas kinetic theory. Sume instruments were used in this research such as pretest and posttest questioners and observation. The questioners collected data on the activity and the interest of students the observation look carefully the situation of students learning process and the test observed whether students knowladgwe was improved. Statistic dependent T- test was used to determine whether the diffarance between pretest and posttest was significant coding ang frequency analysis was used to analysize the questioners and observation data. The result was that (1) students were more active in learning process (2) students liked to study gas kinetic theory and (3) their knowledge were improved. In the next year the same method will be used to learn the gas kinetic theory and thermodinamics theory.