This study aims to analyze the effect of problem based learning models on changes in learning outcomes and students' problem solving skills. This research uses a quantitative approach with Nonequivalent control group design. The sample in this study were students of seventh class of Junior high school. The experimental group was taught using a problem based learning model (PBL) and the control class used a cooperative learning type group investigation. The data obtained were tested using an Independent sample t-test to see differences in the two classes of research. The final assessment showed that the results post-test students' showed Sig.(2-tailed) 0.019< 0.05, which means that there are significant differences. The results of observations for the value of problem solving skills at the end of learning shows Sig.(2-tailed) 0,000< 0.05, which means there is a significant difference. Significant differences indicate that there is an influence of problem-based learning models on learning outcomes and students' problem solving skills.