A severe rain storm that occurred on July 16, 2017, caused flooding of paddy fields and rural houses south of Osong Biovalley. To analyze the flood event that occurred in the Cheongju area and to verify its effects on the Osong area, rainfall frequency analysis was evaluated based on the observed hydrological data. The recurrence frequency of flood events was estimated through rainfall frequency analysis, and the effect of flood events on the estimation of probable rainfall was confirmed. The GATE2012 flood simulation program was used to analyze the flood-damaged area. The program simulation was performed by dividing it into the case where the inflow of the generated discharge within the study area was not reflected and the case where it was reflected. In the case of not reflecting the inflow of the generated discharge, it was divided into the non-operational and normal operation of the pumping and drainage station, and in the case of consideration, the generated discharge was changed and the inundation analysis was performed by classifying it into nine cases. Through this study, it is to improve the reliability of the analysis of flood damage in paddy fields during floods and to contribute to the establishment of a flood prevention plan.