Incidence of soybean sprout rot by Erwinia carotovora subsp. carotovora was examined under several artificial conditions. Under higher temperatures over 3$0^{circ}C$, disease incidence was increased and the rate of soft rot incidence was 22% at 35$^{circ}C$. Artificial injuries of inner cotyledon and seed coat induced the disease above 70% and inhibited the soybean sprout growth. Relative humidity above 90% increased the soft rot to 33% and inhibited soybean sprout growth. When the leaked water collected from soybean sprout was reused for irrigation, the disease incidence was increased.