The changes of dielectric parameters of the grapes which were fallen from different heights and then stored for 3 days were studied by parallel plate capacitor in the rang of 50HZ-1MHZ.At the same fallen height,with the increase of electric conductance,the complex impedance module and equivalent capacitance decrease,electric conductance increase,the loss factor decreased first and then increased,quality factor increased first and then decreased with the frequency increased,and the loss factors and the quality factors were at extreme values at 25kHz.In the fallen range of 80 ~ 200cm,the grapes complex impedance module and quality factor increase first and then decrease and were at the maximum in 120cm,electric conductance,equivalent capacitance and loss factor decreased first and then increased and were at the minimum in 120cm.Overall,the mechanical damages of the grapes can be observed by dielectric parameters changes,and highly correlation between dielectric parameters and electric frequency was exist.