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SnO2-glaze composites were prepared by Sb-doped SnO2 and SiO2- CaO-Al2 O3- B2 O3 glaze. The composites changed from an electrical insulator to a conductor as the SnO2 content increased from 0wt% to 90 wt% . The complex impedance spectra of the fabricated composites were investigated in the frequency range of 100 Hz-40 MHz and three kinds of typical shape of complex impedance spectra were recorded and analyzed. The spectrum is quite close to the model of conduction via nonohmic contacting when the SnO2 content is relatively low. In high loading region, the spectrum shows the conduction patt through ohmic contact chains. In the moderate loading region, the model is a mixture of the above two models. Equivalent circuit of the composite changes from resistor-capacitor circuit to resistor-inductor circuit as the content of SnO2 increases.