This paper reports an eruption of Comet Hale-Bopp that happened in Sep. 10-11, 1996. Two global ejections were erupted. One was in the North West direction of Comet Hale-Bopp,the other was in the North East direction. The velocity of the eruption was about 100 m/s. Meanwhile, according to the light curve of the comet in September, 1996, the V magnitude increased about 2 magnitudes on Sept. 10, 1996.