Objective To investigate the syndrome elements of stable angina pectoris（SAP） to provide objective evidence for syndrome differentiation and treatment.Methods A prospective observation was done on 251 SAP patients confirmed by coronary angiography.The characteristics of TCM symptoms and syndrome distribution were summarized with factor analysis to abstract the syndrome element.Results There were 6 common factors（syndrome element） picked up by the factor analysis.The distribution of syndrome element among the 251 patients were as follows: blood stasis occupying 37.8%

qi deficiency occupying 33.1%

phlegm occupying 16.7%

and yin deficiency occupying 12.4%.Conclusion The major syndrome elements of SAP were blood stasis and qi deficiency.The secondary ones were phlegm and yin deficiency.The location of disease was in heart

mainly with kidney and spleen involved.