Abstract: Combined with the results of rainstorm frequency analysis, China Flash Flood hydrological model was used to analyze the flood peak discharge frequency of small catchment scale and hierarchical nested catchments in Shangliu catchment of Jiangxi Province. The results showed that: China Flash Flood hydrological model showed good applicability in study area. During the calibration and validation periods, the absolute values of relative errors of average runoff depth and peak discharge were within 12% and 7%, respectively, the absolute value of average errors of peak occurrence time were 1.1 h, and the average Nash-Sutcliffe efficiency coefficients were 0.87 and 0.9, respectively. The average peak discharge at small catchments were 78~201 m³/s with from 5-year to 500-year return periods. The corresponding peak discharge at hierarchical nested catchments were 104~810 m³/s, 125~1 041 m³/s, 144~1 202 m³/s, 169~1 329 m³/s, 181~1 436 m³/s, 198~1 571 m³/s, 214~1 712 m³/s and 231~1 889 m³/s, respectively. The study are expected to provide technical support and reference for flood frequency analysis and spatio-temporal patterns in small and medium-sized catchments.