Generally speaking, abdominal aortic aneurysm can be detected by CT angiography of abdominal aorta, abdominal ultrasound, magnetic resonance angiography and other examinations. 1. CT angiography of abdominal aorta: this examination is the golden index to confirm the diagnosis of abdominal aortic aneurysm, which can determine the location of abdominal aortic aneurysm, the degree of vasodilatation, and the presence or absence of intra-aneurysmal thrombus. 2. Abdominal ultrasound: abdominal ultrasound is to observe the reflection of ultrasound waves from the human body, using weak ultrasound waves to illuminate the human body and image the reflected waves from the tissues, which can be used to observe whether there is any abnormality in the wall of the abdominal aorta, and thus play the role of preliminary screening for abdominal aortic aneurysm. 3. Magnetic resonance angiography: Magnetic resonance angiography is a kind of non-invasive vascular imaging method which does not need intubation and contrast agent, and can clearly show the location, shape and size of the lesion. It is recommended that patients with abdominal aortic aneurysm should seek medical treatment in time, and follow the doctor’s instructions to improve the relevant examination and symptomatic treatment.