The span distorted modeling is widely used in wind tunnel tests of transmission tower-line system by reducing the span of conductor through correction coefficient γ，but its applicability to 4-bundle conductors has not been clarified. Based on aeroelastic model of 4-bundled conductors，the aerodynamic force and PSD of two distorted models and one normal model are tested and compared，and the influence of turbulence intensity and yaw wind is further discussed. The results indicate that high order modes are involved in the response of transmission lines，and the mean and RMS values of aerodynamic force increase nonlinearly with the increase of wind speed. Turbulence has a certain effect on the increase of mean and RMS values of aerodynamic force，and could increase the discrepancy of mean force between distorted model and normal model. The aerodynamic force at both ends of the conductor is different under yaw wind，and the difference between mean values of tension is significantly higher than that of drag force.The aerodynamic characteristics of the distorted model with γ=0.8 are in good agreement with those of the normal model except that the RMS value is slightly higher than that of normal model，but a big gap of aerodynamic characteristics is observed between the distorted model with γ=0.5 and the normal model. For 4-bundled conductors，it is recommended to use a span distortion ratio around 0.8 instead of a smaller ratio.