Objective To study the TCM syndrome characteristics of acute diabetic myocardial infarction and non-diabetic myocardial infarction.Methods The questionnaires were used to collect the data from 1 158 cases of acute diabetic myocardial infarction in 6 TCM hospitals of grade III-A in Beijing.All cases were divided into diabetes group（n=361） and non-diabetes group（n=797）.An ACCESS database was established and the TCM syndrome characteristics were compared and analysed in two groups.Results In the diabetes group yin deficiency with fever was common

and the proportion of yang deficiency to yin deficiency was higher significantly than that in the non-diabetes group.In two groups the deficiency syndromes were mainly qi deficiency

and excess syndromes were mainly blood stasis

among which the syndromes of deficiency complicated with excessiveness were the most common

especially in the diabetes group.There were 56 syndrome types in the diabetes group and 74 in the non-diabetes group

among which the deficiency syndrome was mainly dual deficiency of qi and yin syndrome

and the excess syndrome was mainly syndrome of blood-stasis and phlegm obstructing collateral.There were 40 syndromes of deficiency complicated with excessiveness in the diabetes group and 56 in the non-diabetes group

among which the first 4 syndromes included the syndrome of qi-deficiency blood-stasis phlegm-obstruction

syndrome of qi-deficiency blood-stasis

syndrome of dual qi-yin-deficiency blood-stasis phlegm-obstruction

and syndrome of dual qi-yin-deficiency blood-stasis.The proportion of the syndrome of dual qi-yin-deficiency blood-stasis phlegm-obstruction was higher significantly in the diabetes group than that in the non-diabetes group.Conclusion TCM syndromes of acute diabetic myocardial infarction show complicated characteristics

which should be treated with the therapy of elimination and reinforcement

and Chinese herbal remedies of cold and warm in nature used in combination for steadying yang and calming yin.