In the world of education, it is important that the teacher considers that the knowledge that students had learned in school can be applied in the different situation either when students still in school or when they are faced with real inability to apply the knowledge is called lack of conceptual understanding. The researcher then decided to use Problem Based Learning (PBL) to overcome this problem. The aim of this research is to found out whether the implementation of PBL can increase student's conceptual understanding and the effective ways to implement PBL in order to increase student's conceptual understanding. This research is a Classroom Action Research, and this was a two cycle research where the research used student's written test, student's questionnaire, student's interview, teacher's interview, teacher's observation form, and journal reflection as instruments to measure student's conceptual understanding and the implementation of PBL based on the Christian perspective. Based on the analysis and discussion, it can be concluded that the implementation of problem-based learning could increase students' conceptual understanding based on the Christian perspective.