Abstract-This research aimed to analyze: the effect of problem based learning model on student's problem solving ability; the effect of creative thinking ability on student's problem solving ability and interaction between learning model and creative thinking ability in increasing student's problem solving ability. This research was a quasi-experimental design with two group pre-test post-test design. Experimental group taught by problem based learning model consist of 40 students and control group taught by conventional learning consist of 40 students. The data were analyzed by two ways of variances. Statistical test with 0.05 significant levels showed that: student's problem solving ability that taught by problem based learning model were greater than the conventional learning; problem solving ability group of students that have high creative thinking ability were greater than the students that have low creative thinking ability; there were interaction between learning model and creative thinking ability in increasing student's problem solving ability; the role of creative thinking ability in increasing student's problem solving ability on experimental group were greater than on control group.