Based on the theory of fragmentation fractal dimension, particle size data of 837 loess samples from LOP (the lower part of Chaoyang section) in Liaoning were analyzed using linear regression and piecewise linear regression to select appropriate scaling range for loess in this area. For the single fragmentation fractal dimension, values of fractal dimensions (DF) are between 1.446 and 2.027 with determination coefficient more than 0.900. The scaling range of 0.1-54.4 μm was determined. While two scaling range of 0.1-7.64 μm (F₂) and 7.64-54.4 μm (F₁) were obtained by a cutoff of 7.64 μm ±1.21 μm (CV=15.870%) using piecewise linear regression. The high coefficient of determination ranges from 0.978 to 0.999 with coefficient of variation for 0.438%. Furthermore, theD_F1 is greater than D_F2. The D_F values from piecewise fractal are different from the single fractal dimension. This suggests that D_F values could be different due to different scaling range selected for specific loess. Therefore, appropriate scaling range should be selected first before using fractal models. Due to the possible relationship with loess pedogenesis and deposition environment, interpreting D_F values is helpful for understanding loess pedogenesis and deposition environment.