Comments on the Solar Activities During the Rising Phase of Cycle 21

The activities of sunspots, calcium plages, 2800 MHz flux, solar flares and proton events during the rising;phase of Cycle 21 are expounded in this paper.The statistical results show that at the time interval the solar activities reached the maximum through three impulsive rises.The solar active longitudes of the rising phase are determined which are Ll60°-210° and L50°-90°.And finally, the most powerful active region is also discussed in this article.