Abstract: Three kinds of different tabular silver halide crystals with various distribution of iodide ions were prepared. Their micro-structure analyses in the microaneas of a crystal were determined by combination of scanning transmissive electron microscopy (STEM) and energy dispersive X-ray spectrometer (EDS). The dielectric losses of tabular silver crystals with different structures and tabular silver halide crystals having the same structure, but with various amount of iodide ions were examined.