Triaxial shear tests were conducted to measure stress-strain curves under the consideration of loess structural differences in different regions.Three different typical loess areas of Luochuan,Lanzhou,and Yangling were selected.Based on Duncan2chang hyperbolic model,a simple way was adopted to determine structural parameters,which is better to reveal the changes and factors of structural parameters.The change in the structural parameters of the three regions was found.Results showed that unsaturated loess structural parameters firstly decreased with the increase in shear strain and then remained at a stable level.Water content and consolidation stress had significant influences on structural parameters.Under the same pressure condition,the lower the moisture content,the greater the structural parameters of loess and under the same moisture condition,the smaller the pressure,the greater the structural parameters of loess.As far as different regions are concerned,the strongest structural characteristic of loess under the same conditions was Yangling loess and it was followed by Luochuan loess.Lanzhou loess structure was the weakest.