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Air injection desaturation method (i.e. Air-des method) is one of the liquefaction countermeasures methods that the purpose is to increase liquefaction resistance of saturated ground due to earthquake loading. Effects of air injection apply immediately to the ground which remain to unsaturated condition, namely, degree of saturation was less than 100 %. Geotechnical engineers have concern further to changing of degree of saturation after performing of air infection. To establish the relationship between degree of saturation and resistivity for ground is the purpose in this study. The Soil Water Characteristic Curve (SWCC) test apparatus with employing the resistivity measurement system was used, and describe well numerical equation accepting degree of saturation and rate of resistivity such as concerning function parameters. The suggested numerical equation applied to in situ test results, and it was proved that the Air-des method was possible to remain the stabilization of unsaturated condition for ground.