Objectives:In situ coronary calcium is a specific anatomic marker of coronary atheroma. Electron beam CT is the first noninvasive method to determine coronary artery calcium. The aim of this study was to investigate the coronary artery calcium(CAC) in Chinese. Methods:Nine hundred and fifty-nine Chinese cases undergoing electron beam screening were divided into six age groups: ①younger than 29,②30～39,③40～49,④50～59,⑤60～69,⑥older than 70 years old, and were divided into another three groups according to coronary artery disease(CAD) symptoms.①symptomatic group: symptomatic patients with CAD;②doubtful symptom group: patients had atypical chest pain, but without sufficient information of angina,③asymptomatic group: patients without CAD symptoms. Results:① Prevalence of CAC and the total scores of CAC in asymptomatic men and women increased significantly with increased ages. ② There was a large increase in the prevalence of CAC in asymptomatic women between the age of 40～49 and 50～59. Conclusions: ①Coronary artery calcium prevalence increases with age in both men and women.②There is a marked difference in the prevalence of calcium between men and women.③The noninvasive detection of CAC by EBCT has certain prognostic and predictive value for coronary artery disease.