Coronary artery disease is known as coronary atherosclerotic heart disease. The gold standard for the diagnosis of coronary artery disease is still coronary angiography or intracoronary ultrasound, but it is invasive with certain risks and high costs, and cannot be popularized because it requires examination in large hospitals with certain technical level. Therefore, in primary hospitals, the diagnosis is generally based on clinical manifestations, age of onset, electrocardiogram and cardiac ultrasound, and the sensitivity, specificity and accuracy are not high. Recently, the specificity of carotid artery plaque for the diagnosis of coronary artery disease was found to be 85.71%, sensitivity 75.75%, accuracy 77.50%, positive predictive value 96.15%, negative predictive value 42.87%, false positive rate 14.29%, and false negative rate 24.24% by carotid ultrasonography in comparison with coronary angiography. It provides a good new window for the diagnosis of coronary heart disease. The study pointed out that the underlying lesion of coronary artery disease is atherosclerosis, and the progression of atherosclerotic lesions, especially platelet aggregation and thrombosis due to rupture of vulnerable plaques, is the main cause of acute coronary events (acute coronary syndrome, sudden coronary death). Atherosclerosis is a systemic lesion that mainly involves large, medium and small arteries of the circulatory system, and can involve both coronary arteries, carotid arteries and other arteries such as cerebral arteries, renal arteries and mesenteric arteries. In terms of anatomy, carotid artery and coronary artery have similar characteristics, both are smooth muscle arteries, and the pathogenesis of atherosclerosis is the same. A large number of clinical and epidemiological data from home and abroad confirm the close relationship between carotid artery and coronary artery sclerosis. The authors applied carotid ultrasonography and showed a high correlation between carotid atheromatous plaque and coronary heart disease. The specificity, sensitivity, and accuracy of carotid atheromatous plaque for the diagnosis of coronary artery disease were similar to those reported in national and international studies. Coronary events tend to occur in people without any previous clinical history, more than 1/3 of coronary events occur in people without a history of chest pain, and more notably, less than 1/6 of coronary events occur in people with ≥70% coronary stenosis, and the majority of events occur in lesions without hemodynamic significance. It is important to identify subclinical atherosclerosis before it becomes pathologically significant and to intervene early. Carotid artery anatomy is superficial, easy to find and fix, and carotid ultrasound is noninvasive, safe, inexpensive, and reproducible, which is easily accepted by patients and popularized at the grassroots level. By placing the ultrasound probe directly on the carotid artery, it can better distinguish between the vessel wall and the lumen, and not only accurately measure the vessel wall thickness, i.e., intima-media thickness, but also identify certain atherosclerotic features. In recent years, clinical studies have confirmed that the coronary and carotid arteries are closely related in terms of the degree of atherosclerosis, and measurement of carotid atheromatous plaque appears to be a more reliable alternative method for detecting coronary atherosclerosis and may serve as an independent predictor of coronary heart disease. Foreign studies have also suggested that there is a positive relationship between the presence of carotid plaque and the number of coronary lesions due to coronary atherosclerosis, thus suggesting that the presence of carotid plaque may be a predictor of coronary heart disease. Carotid plaque is an equal risk of coronary artery disease, early detection, early diagnosis, early prevention and control, carotid ultrasound and the Golden Triangle program complement each other, which is suitable for heart and brain stroke prevention and elimination in the bud!