A negative exercise treadmill test indicates that there is no severe coronary stenosis, but minor stenosis or small plaques and blood clots, etc. cannot be ruled out. Exercise plate test is one of the commonly used methods to diagnose coronary artery disease in the clinic, which can reflect the lack of oxygen or insufficient blood supply to the heart, and for patients with more serious coronary stenosis, a positive result will appear through the plate test. The details are as follows: 1. Positive plate test: it means that typical angina pectoris symptoms appear during exercise, and the horizontal type or lower wedge depression of ST segment of electrocardiogram is greater than or equal to 0.1mV change, which lasts for 2 minutes as the positive standard of exercise test, and this kind of situation indicates that the patient has myocardial ischemia and hypoxia, and coronary artery stenosis. 2. Negative exercise plate test: it means that the test fails to induce myocardial ischemia symptoms or electrocardiogram changes, and negative exercise plate test means that there is no serious vascular stenosis and coronary artery disease cannot be diagnosed. 3. False-negative plate test: Individuals may have false-negative cases, which need to be combined with symptoms and other tests, such as coronary CT, or coronary angiography and related laboratory tests to determine the diagnosis. In conclusion, the results of the exercise plate test cannot absolutely exclude coronary stenosis, and the doctor needs to determine the diagnosis by combining the medical history, symptoms and other tests.