Objective To explore the syndrome elements of angina pectoris of coronary heart disease and their combination laws so as to deepen further the syndrome standardization study.Methods The clinical epidemiologic survey was carried out on 297 patients with angina pectoris of coronary heart disease diagnosed by coronary arteriography and the data was processed with medical statistics.Results（1）Of syndrome elements of angina pectoris

blood stasis occupied 86.5% and qi deficiency 78.8%

being the main ones.Others lining up from more to less were heat stagnancy

phlegm turbidity

qi stagnation

yang deficiency

yin deficiency

and cold congealing.（2）There were a total of 74 combination patterns of syndrome elements

among which the combination of deficiency element with excess accounted for 90.2%

while the combination of excess elements was 9.8%.（3）The main patterns of combination could be summed up as:qi deficiency and blood stasis plus others

qi deficiency and phlegm turbidity plus others

yang deficiency and blood stasis plus others

and qi stagnation and blood stasis plus others.These four patterns covered 90.2% of all cases.Conclusion Qi deficiency and blood stasis are the basic mechanism of angina pectoris.Qi deficiency and blood stasis plus other syndrome elements is the main combination pattern.The combination of syndrome elements owns certain regularity.