The erosion of gully head forward,gully bank expansion,and gully bed cutting seriously affect regional grain production and environmental quality.Taking the gully head,gully bed,and gully bank of three stable eroded gullies in Yuwa Watershed of Pengyang County,Ningxia as subjects,this study combined field survey sampling with laboratory experiment.The soil physicochemical properties and erodibility K values of different parts of erosion gully (gully head,gully bed and gully bank) were analyzed.The 0—10,10—25,25—40,40—55,55—70 cm soil,soil mass water content (θ),soil bulk density (ρ),soil total porosity (φ),soil clay (CLA),soil silt (SIL),sand (SAN) content,＞0.25 mm water-stable aggregate content (R_0.25),soil mean weight diameter (MWD),soil geometric mean diameter (GMD) and soil organic matter (SOM) content were collected,and EPIC model was used to calculate K value of soil erodibility.The results showed that:(1) The quality of each part of the erosion gully average moisture content,total porosity,organic matter,silt content,aggregate content of water stability > 0.25 mm,average weight diameter and geometric mean diameter of the size of the order of gully bed > gully bank > gully head,the average soil bulk density and sand content of each part were gully head > gully bank > gully bed,the average soil clay content was gully bank > gully head > gully bed,the mechanical composition of the soil in each part was silt > sand > clay.(2) The K value of soil erodibility in each part of the erosion gully ranges from 0.032 9 to 0.039 5(t·hm²·h)/(MJ·mm·hm²),which belonged to the medium erodibility.The average K value of erodibility was gully head > gully bank > gully bed.(3) The K value of soil erodibility was significantly negatively correlated with soil silt and clay content,and significantly positively correlated with soil sand content,organic matter and mass water content.Soil erodibility K value in gully bed was significantly negatively correlated with R_0.25,MWD and GMD (p<0.01).As the most active part of erosion gully,the number and stability of aggregates were increased by increasing soil organic matter content and silt content,thus reducing soil erodibility.The results can provide basis for ecological stability and evaluation of erosion gully.