Smog is a rare cerebrovascular disease that is rare worldwide and mainly occurs in Asian regions, but in recent years, the number of patients with smog found in China has been increasing. Clinically, patients with smog disease are found to suffer from headache and dizziness, weakness of limbs, aphasia, memory loss and other obvious symptoms, and in severe cases, cerebral infarction or cerebral hemorrhage, which can be extremely dangerous to patients’ lives and therefore require immediate surgical treatment once an attack occurs. Due to the limited medical equipment in hospitals and the lack of knowledge of physicians about the disease, many patients with smog cannot be detected in time and thus cannot receive treatment in time, making the disease progress and gradually deteriorate, which not only makes the surgery more difficult but also makes the patients suffer from the fear of attacks from time to time. When symptoms of smog are suspected, it is important to undergo more tests as soon as possible. Then some patients have bilateral smog and want to know if bilateral smog is serious and if it can still be treated. In fact, both unilateral and bilateral smog can be relieved with effective surgery, and combined vascular bypass is a very effective procedure that has treated many patients with either unilateral or bilateral smog. In the intervening months, patients feel a significant reduction in symptoms. Combined vascular bypass has allowed many families to emerge from the shadow of smog.