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This study aims to: 1) Produce qualified learning materials which is developed based on Problem Based Learning for class XI SMK Swasta Ar-Rahman Medan; 2) Analyze the improvement of students mathematic problem solving ability which is learned using Problem Based Learning materials. This research is a development research using the Thiagarajan 4-D development model. Trials of learning materials based on Problem Based Learning were conducted three times to obtain quality devices. The first trial was conducted in class XI TKJ 1, the second trial was conducted in class XI TKJ 2 and the disseminate stage in class XI AK. From the results of the study obtained: 1) Problem Based Learning based learning materials that are taught have good quality at the stage of dissemination; 2) The ability to solve mathematical problems learned by using Problem Based Learning devices is increased during the disseminate stage.