A strong earthquake happened in 1833 around Songming with M 8.0,which has been the largest one in Yunnan Province so far. In this paper,we have researched the seismicity around the epicenter of the M8.0 earthquake(24.7°~25.5°N,102.3°~103.3°E). The method of seismic density calculation has been utilized to deal with the seismic pattern of small and middle earthquakes recorded by instruments since 1966. Based on seismic density contours,two seismic density zones are identified. The temporal distributions of earthquakes in the two seismic density zones are analyzed in different time windows. According to the relationship between the seismic density and the parameters of strong historical earthquakes,the emendation of the epicenter of the 1833 M8.0 earthquake is suggested. Spatial-temporal dynamic patterns are analyzed. The results show the seismic density zones start from NE and develop to SW direction since the new century. This variation might illustrate the fluctuation of regional stress to some extent.