This study has investigated multiple-site small cracks in the low cycle fatigue of SUS316L at 873K in air by using the four-point probe DC potential difference method. Small probes with 1-mm spacing between the electrodes were used in order to evaluate small cracks of some hundred micrometers. Morphology of the cracks was evaluated by standard deviation of potential difference σV which detected by the probes and by the crack density by laser microscopy. As a result, it was shown that σV monotonically increased with increasing number of strain cycles and fatigue process was classified into four stages. Furthermore, statistical analysis showed that the cracks initiated at random sites in early stage. However, the randomness was diminished and σV increased significantly with growth and coalescence of the cracks. These results revealed that standard deviation of normalized potential difference could evaluate initiation, growth and coalescence of multiple-site small cracks in each stage.