This study aims to determine the effect of applying the CUPs learning model (Conceptual Understanding Procedures) on students' conceptual understanding of heat and its transference. This research was conducted at SDN 82 Singkawang. The type of research used is quantitative with a quasi-experimental design method (quasi-experimental). The research design used was a non-equivalent pre-test and post-test control group design. The population in this study were all fifth grade students at SDN 82 Singkawang. The sample was taken using purposive sampling technique, the sample was selected to be the experimental class VA class, namely the experimental class using the CUPs learning model and the control class VB using the direct learning model. The results of the study can be concluded that: (1) There is an effect of the CUPs model on students' understanding of the concept of heat and its transfer, it is obtained that t_count>t_table is 3.4195>2.01006 then H_a is accepted and H_o is rejected. (2) There is an increase in students' conceptual understanding after the application of the CUPs learning model of 0.76 in the high category. (3) Students' responses are classified as very good towards the CUPs learning model.