Recently, the calculation of flow concentration in ungauged or partially gauged regions has been occupied a spot in the hydrologyresearch. The methodology of geomorphological instantaneous unit hydrograph (GIUH) on the basis of terrain parameters has becoming a commonused and well performed approach relying on the independency of the historical observed rainfall and runoff data. In order to investigate themethod of runoff simulation for the ungauged areas in Jiangsu province, this paper studied a watershed with typical topographic andgeomorphologic characteristics (the Luoyanghe Catchment in Zhenjiang). In the Luoyanghe Watershed, the measured runoff data were simulatedwith the method of GIUH which is extracted based on the topography feature values. To validate the effect of the GIUH approach, an analysis of thecomparison between the observed and calculated runoff of 4 flood events in the flood season in 2016 and 2017 was launched. The results indicatethat the GIUH computed by the topographic and geomorphologic indices is feasible to the flood simulation for the Luoyanghe Watershed. SinceLuoyanghe is a representative catchment in Jiangsu hilly area, the GIUH can be generalized in the flood simulation to the other areas.