Using parallel plate capacitor with different electrode size,different number lily leaves were clamped between electrode plates to determine its dielectric properties.The result shows that in different electrode size and plate spacing,loading frequency are negatively related on relative permittivity and complex impedance,and are positively related on the electric conductance.When loading frequency is about 60 K,there were extreme values of loss factor,phase angle and the quality factor,which phase angle and the quality factor were the maximum value and loss factor was minimum value.With the increase of the electrode size,the relative permittivity and conductivity values showed an increasing trend,and the impedance value was decreasing.When the quantities of lily leaf increased in the plates,the relative permittivity,loss factor and electric conductance decreased,and the phase angle,the quality factor and the complex impedance values increased.This study is expected to provide some theoretical basis and test support on the dielectric properties' nondestructive testing of Lilium davidii Var.quality.