The cltsracterlstlcs or a strong aurora sudatory obs erved at Antarctic Zhongshan station (magnetic latitude=74. 5°) on 8 April, 1999, were discussed and analyzed. The developing steps of the aurora substorm that happened in dusk time were almost the same with that or mldulgot a urora substorm. The averagedmoving sac of the aurora arc toward pole area during the substorm expansion phas e was about 3. 0 km/s,westward-traveling surge speed was about 2. 0 km/s. The extension from south to north in the substorm cancover 1100 km in distance.
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