Several typical earthquake swarms occurred in Kalaqin region, Inner mongolia, in history, and a new one occurred here from Aug. 19 to Sept. 14, 2008. In this paper, the historical earthquake swarms in this area and the relationship with moderate-strong earthquakes in around areas are analyzed. The result shows that the earthquake swarms activities in Kalaqin area have some corresponding relation with the moderate-strong earthquakes in around areas. So the new events have important foretell hint to forecast moderate-strong earthquake in the region.