The photographic emulsion which consists of conductive silver halide microcrystals embeded in isolating gelatin can be regarded as a heterogeneous medium showing the interface polarization called the Maxwell-Wagner effect. The effects of various measuring conditions, such as gelatin type, degassing degree, moisture content upon the ionic conductivity of emulsion microcrystals have been studied with the aid of dielectric loss method. The change of dielectric loss of photographic emulsions versus frequency was determined as a function of raw material quality, iodide content, the addition of various chemical sensitizers and the addition of different stabilizers. From these measurements, ionic conductivity and in some cases, the space charge characteristics of a series of silver halide emulsion microcrystals are presented and discussed.