A total of 250,000 people were investigated and 4001 cases of cardiovascular diseases from January 1994 to December 2000 in Beijing were analyzed. The results show that cardiovascular diseases are closely rela ted with relevant meteorological factors and seasons. The incidence of Acute Ischemic Stroke (AIS) is higher in summer and that of hemorrhage is higher in spring and autumn. Low and high temperature, especially the violent variation of pressure and temperature may be important meteorological factors for cardiovascular diseases.