The following results are obtained from the examination of 50 Ha flares. (1) all flares with HXRBS are detectabe from the emission of Hα±2A. They have at least two Ha kernels (I flare/I bac. >1.15 on Hα + 2Å) located in the opposite polarity regions; (2) the Ha brigh-tenings start earlier than HXRBS, while the Ha peaks, which correspond to the spikes of HXRBS very well, come later than that of HXRBS by several seconds; (3) if the count rates of HXRBS are more than 1000, the kernels of Hα+2A cover the penumbra, if the count rates are less than 200, the kernels do not cover the penumbra.