Abstract
On July 14, 2000, a powerful solar flare(X5.7/3B) associated with a violent halo CME launched in active region NOAA 9077 near the solar disk center. By using the time sequence of the solar photospheric vector magnetograms and H β chromspheric magnetograms, and H β filtergrams from Huairou Solar Observing Station(HSOS), we explored the causes of the flares eruption. We found that the occurrence of reversed polarity strucures (RPSs) in vector magnetic fields were closely related to the eruption of X5.7/3B flare and surge, and they should be the key ingredient to the high flare-productivity of sunspot group, especially, number and extent of the occurrences of the RPS in a active region could determine the solar event level.
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