Abstract Electrical conductivities of pure AgI and AgI containing DSPP (η-Al203, 0.05 and γ-Fe2O3, 0.6) have been measured as a fuctions of composition and temperature. The conductivity in β-phase was increased by the addition of DSPP. The maximum increment which appears at about 40-50 mol% DSPP is two or three orders of magnitude at room temperature. The conductivities in α-AgI contain DSPP decreases and activation energy increases. Both conductivity measurement and DTA experiment show that DSPP influences the phase transition, especialy α-phase to β-phase trasition. For instance, the α- to β-phase transition temperature of AgI (Al2O3 50mol%) is 17℃ lower than that of pure AgI. The dc polarization experiment carried out for AgI (γ-Fe2O3 50mol%) system, indicated the AgI (γ-Fe2O3) is a n-type conductor and the electronic conductivity is negligible compared with the total conductivity.