Objective :To explore the distribution characteristics of the TCM Syndromes of CHD ,improve the diagnostic standards of the common syndromes. Methods :. Take the clinical epidemlological survey of the TCM Syndromes of CHD in Changsha city by whole random sampling,and then study the information by Cluster analysis Logistic regression analysis? principal component analysis,etc. Results:①On the basis of CHD epidemlology investigation, study the law of symptom complex by cluster analysis.②elect the principal and secondary symptom of CHD Syndr...