The ionic conductance of series of montmorillonite which have different submicroscopic structure have been studied after seperating from associated minerals. The absorption bands at 915cm-1 and 840cm-1 in the IR spectra and the resonance with g≈4.3 in the ESR spectra vary with the submicroscopic structure. The influence of the structure on the conductance of the montmorillonites have been discussed.