Effects of cladding size changes on electric conductivity of copper-aluminum-copper cladding plate were examined by the FEM （finite element method） software.It is found that with a fixed loading

electric conductivity of copper-aluminum-copper cladding plate is increased with increasing in copper thickness.However

with copper thickness more than 0.5 mm

effects of copper thickness on impedance of cladding plate can be neglected.At a fixed cladding width

with increasing in cladding thickness

impedance of the cladding plate is greatly decreased

while effects on electric conductivity are slowly weakened.At a given copper thickness

with increasing in cladding thickness

impedance of the cladding plate is decreased

and with increasing in width of cladding plate

effects of thickness on impedance of the plate are greatly weakened.