Ventricular hemorrhage is a serious consequence of smog and one of the more common manifestations of the disease. A ventricular hemorrhage is a breakthrough of blood into the ventricular system and has a very high rate of disability and mortality. It is often an acute lesion that requires time-critical treatment. Let’s first look at why smog can cause sudden ventricular hemorrhage. Smoldering disease is an occlusive cerebrovascular disease that is caused by chronic progressive stenosis of the major bilateral branches of the cerebral arterial ring to the point of occlusion, which can cause an inadequate blood supply to the brain. In order to alleviate this inadequate blood supply, the skull base penetrating arterial network causes abnormal hyperplasia, forming a network of small, fragile vessels to compensate for the blood supply. These small vessels appear as a dense mass of small vessels on cerebral angiography, resembling smoke, which is the reason for the name of the disease. These small vessels are very thin and fragile, so they can easily rupture and bleed, often very suddenly. For the treatment of sudden ventricular hemorrhage caused by smog disease, the first thing is that the ventricular hemorrhage should be treated first in the early stage, and generally external ventricular drainage, ventriculoscopic treatment or lumbar pool drainage can be taken. After symptomatic treatment, surgical treatment of smog should be performed as soon as possible after three months, otherwise it may also cause repeated cerebral hemorrhage, ventricular hemorrhage, etc., and the mortality rate will be higher if there is another cerebral hemorrhage. At present, the combined vascular bypass surgery is a very advanced and effective way for the treatment of smog disease. Through the dual procedure of direct bypass + patching, a perfect bypass blood channel is established for the patient’s brain to fully improve the brain blood supply and effectively prevent cerebral ischemia, cerebral infarction and cerebral hemorrhage.