Objective To investigate the the level of red blood cell microparticls in patients with acute coronary syndromes and the correlation with severity of coronary artery disease and with its influencing factors.Methods A total of 140 patients were sdected into our study from Jun 2016 to Feb 2017.All patiens were identified through coronary angiography.There were 108 patients with acute coronary syndromes (ACS) mentioned as experimental group,which including 25 patients with single vessel disease,27 patients with double vessel disease,27 patients with triple vessel disease and 29 cases of multi-vessel disease,and 32 patients of non-coronary heart disease group mentioned as control group.Each patient was fasting and drawn the periheral venous blood after the next day of hospitalized then analyzing blood lipids,blood routine and biochemical indicators.The expression of CD235a in erythrocyte derived microparticles was quantitatively analyzed by flow cytometry.The Gensini score was calculated based on the Results of coronary angiography.Results Compared with the non-CHD group,the levels of red blood cells microparticles (44.37％ ± 15.48％),low density lipoprotein cholesterol (3.18 ± 1.16mg/L),lipoprotein a (215.23 ± 183.10mg/L) and high sensitivity C Protein (19.58 ± 26.94mg/L) were significantly increased,and the difference was statistically significant (P ＜ 0.05).The levels of erythrocyte microparticles and low-density lipoprotein cholesterol in the subgroups of acute coronary syndromes were statistically significant (P ＜ 0.05),with erythrocyte microparticles levels and low-density lipoprotein cholesterol levels (P ＜ 0.05).There was a positive correlation between Gensini score and erythrocyte drived microparticls (β =2.157,P ＜ 0.05),and negatively correlated with high density lipoprotein (β =-15.579,P ＜ 0.05).Conclusion The level of Gensini scores were calculated based on the results of coronary angiography.That in patients with acute coronary syndrome is significantly higher than that in patients with non-coronary heart disease.The level of erythrocyte derived microparticls is closely related to the severity of coronary artery disease.The level of erythrocyte derived microparticls has a high value in predicting the severity of coronary artery disease in acute coronary syndromes.