The purpose of this study was to determine the effect of the contextual teaching and learning (CTL) model based on the matlab program on student' learning outcomes at the material of force for eight graders of SMPN 3 Narmada 2020/2021. This research is a quasi-experimental research with a control group method. The subjects in this study were all the eight graders of SMPN 3 Narmada. The samples in this study were taken through purposive sampling, one was the class of VIII-A as the experimental group which consisted of 25 students and the other one wasc the lass of VIII-B as the control group,which had totally 25 students. The test was made in the form of multiple choice questions. The instrument used was a test that had been tested for its feasibility. Based on the results of the test calculations, it found that the value of tcount 5,276 while the ttable value was at a significant level of 5% with dk = n1 + n2 - 2 = 25 + 25 -2 = 48, the the value of ttable was 2.457. Hence, based on the calculation result, it could be concluded that tcount>ttable. In other words, it can be said that the hypothesis (Ha) was accepted. This means that "there was an effect of contextual teaching and learning (CTL) model based on the matlab program in improving students' learning outcomes in the material of force for the eight graders of SMPN 3 Narmada academic year 2020/202.