Abstract: Abstrat：Objective   To study the correlation between normal level of thyroid hormone and gensini coronary scoring system．Methods   233 patients who were treated with CAG and diagnosed of patients with coronary heart disease were divided into 4 groups based on gensini coronary scoring system ,all the patients were determined kinds of index which include triiodothyronine(T3),thyronine(T4),free thyronine(FT4), free triiodothyronine (FT3), thyroid stimulating hormone (TSH) and correlation between thyroid hormone level and gensini coronary scoring system was studied by Spearman correlation analysis and Multiple regression analysis.Results   No significant difference was found in the levels of triiodothyronine(T3),thyronine(T4),freethyronine(FT4),Cholesterol(CHO)andTriglyceride(TG) between the 4 groups(P>0．05).FT3 and HDL-C decreased with the increase of the degree of coronary artery lesions（P<0.01）, AGE and LDL-C increased with the increase of the degreeof coronary artery lesions(P<0.05),there was statistical significance.Negative linear correlation was found between the gensini coronary scoring system and FT3、HDL-c,was positively correlated with age and LDL-C .both the index Was independently correlated to Gensini integral.Conclusion   the lower level of FT3 is an indepent risk factor for lesion severity of CHD．

Key words: thyroxine, triiodothyronine, Coronary artery disease, Gensini score