Ionic conductivity of AgI-Ag2MoO4 and AgI-Ag2O-B2O3 were measured under hydrostatic pressure up to 3000 atm. Ionic conductivity of all the glasses monotonically decreased as the pressure increased, which is similar to the AgI-AgPO3 system by Angell and Zhou but in contrast to the data by Senapati et al. The activation volume of these glasses is in the range from 1.5∼2.5 cm3/mol, which is almost equal to the value estimated by the free-volume model. A good correlation was found between the ionic conductivity and bulk modulus of AgI based superionic glasses. The strain term of energy barrier for ion migration was estimated by Keyes's continuous model, which is in good agreement with experimental value. This result suggests the strain energy effect is dominant in AgI based superionic glasses; it is much in contrast to the Li+ conducting glasses where electrostatic barrier is dominant.