Subarachnoid hemorrhage ct films show a dense image of the subarachnoid space. Cranial ct is the first choice of examination method to confirm the diagnosis of subarachnoid hemorrhage, manifested as the subarachnoid space appears high-density image, will show the phenomenon of white and bright. Typically, high density images can be seen in the longitudinal and lateral fissure areas, the annular pool, the anterior bridge pool, etc., and some of them can be seen in the ventricles of the brain with high density images or hematoma formation. Cranial CT can also determine whether there is parenchymal or ventricular hemorrhage and whether it is accompanied by hydrocephalus or cerebral infarction, and can indirectly assist in determining the location of intracranial aneurysms. Dynamic CT examination can help to understand the hemorrhage absorption, whether there is rebleeding, etc.. It is recommended that the CT results be analyzed in the context of the patient’s specific situation, interpreted by a professional physician and given treatment guidance.