In this study, the basic properties of polymer-modified mortar using cement clinkers as fine aggregates were evaluated. As a result, it was confirmed that the mortar using cement clinker had excellent strength development and durability. It is considered that this is because the interface between the cement clinker and cement paste become dense due to the hydration reaction of the cement clinker. In addition, the polymer film was formed around the cement clinker, which also contributed to the improvement of physical properties.