In this study, the effect of regional climate change on precipitation in the 21^st century was investigated in Mokpo city, using RCP(Representative Concentration Pathways) 4.5 and RCP 8.5 climate change scenarios. The annual precipitation in the last 21^st century was projected to increase 6.12 %(RCP 4.5) and 13.41 %(RCP 8.5) with the 30-years variations of +46.36 mm(RCP 4.5) and +94.50 mm(RCP 8.5). The annual precipitation intensity in the last 21^st century was projected to increase 8.64 %(RCP 4.5) and 14.84 %(RCP 8.5) with the 30-years variations of +0.695 mm/day(RCP 4.5) and +1.160 mm/day(RCP 8.5). The annual heavy rain days in the last 21^st century were projected to increase 8.33 %(RCP 4.5) and 50 %(RCP 8.5) with the 30-years variations of +0.116 days(RCP 4.5) and +0.754 days(RCP 8.5).