Smog is a rare cerebrovascular disease with a low incidence. With the development of medical examination technology, the examination rate of smog disease has increased in recent years, so what kind of examination is done for smog disease? Nowadays, medical imaging technology is more developed, and the means to check and diagnose smog is more popular, and generally larger hospitals have this condition. He said that CT angiography (CTA), magnetic resonance imaging (MRI), magnetic resonance angiography (MRA), and digital subtraction angiography (DSA) can all be used to diagnose smog, and DSA is the gold standard for diagnosing smog. After the diagnosis of smog disease is confirmed, surgical treatment should be performed as soon as possible. According to a lot of scientific studies, conservative treatment is not good for smog. As for surgery, the type of surgery is also important. Currently, there are three types of surgery, namely traditional bypass surgery, single patch surgery and combined vascular bypass surgery. After years of clinical practice, combined vascular bypass surgery has great advantages in improving cerebral blood supply, i.e., it is a form of double bypass, which can establish sufficient good blood circulation channels for the brain, improve cerebral blood supply, and prevent cerebral infarction and cerebral hemorrhage.