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Objective: To explore the diagnostic value of PDCD4 on the degree of arterial stenosis in “blood stasis” coronary heart disease. Methods: Select 80 patients with coronary heart disease in the Second Cardiovascular Zone of the First Affiliated Hospital of Guangxi University of Traditional Chinese Medicine in April 2020, and divide them into the “phlegm toxin” group (n=40) and the “phlegm stasis” group (n=40) based on the dialectics of traditional Chinese medicine. ). Record the gender, age, smoking, and alcohol consumption of the subjects between the two groups, and detect their white blood cell count, neutrophil count, platelet count, platelet volume, platelet distribution width, blood creatinine, uric acid, cystatin, and fibrin The expression levels of original, high-sensitivity C-reactive protein, D-dimer, total cholesterol, triglycerides, high-density lipoprotein, low-density lipoprotein, apolipoprotein a, apolipoprotein b, and PDCD4. Multivariate logistic regression analysis was used to screen out the risk factors that affect coronary plaque formation, and the receiver operating characteristic (ROC) curve of each index was established to evaluate the severity of coronary stenosis in patients with stasis coronary heart disease by each index and combined index Diagnostic efficiency. Results: The two groups of patients were tested in terms of gender, age, smoking, drinking, triglycerides, cholesterol, high-density lipoprotein, low-density lipoprotein, apolipoprotein-a, apolipoprotein-b, white blood cell count, neutrophil The cell count, platelet count, platelet volume width and platelet distribution width were not statistically significant (P>0.05); the expression levels of hypersensitivity-C-reactive protein, serum creatinine, cystatin, uric acid and PDCD4 were statistically significant between the two groups Difference (P<0.05), and the corresponding hypersensitivity-C-reactive protein, creatinine, cystatin, uric acid and PDCD4 expression levels in the blood stasis group were higher than those in the phlegm blood stasis group. After multivariate logistic regression analysis, the level of PDCD4 in peripheral blood [OR=31.088, 95％CI (2.498, 3.869)] was an independent influencing factor of the “stagnation” type of coronary heart disease, and PDCD4 was diagnosed as the “stagnation” type of coronary heart disease The area under the ROC curve (AUC) is 88.6％, 95％CI (1.894, 2.532) (P=0.29); the level of PDCD4 in peripheral blood is positively correlated with the number and severity of coronary artery disease, the number of coronary artery disease and stenosis The greater the degree, the higher the detection value of PDCD4, (P<0.05). Conclusion: The expression level of PDCD4 in peripheral blood is closely related to the subtype of “stasis toxin” and the severity of coronary vascular stenosis. It can be used as a quantitative diagnostic index for the diagnosis of “stasis toxin” coronary heart disease and the severity of coronary vascular stenosis.