Subarachnoid hemorrhage and cerebral hemorrhage must be properly differentiated in the clinic, to avoid the occurrence of missed diagnosis and misdiagnosis, because in many cases it is really difficult to distinguish between these two diseases. Most of the time, head CT can only have a basic identification, cerebral hemorrhage in the head CT can be manifested as a round or oval and irregularly shaped high-density image, often bleeding is relatively continuous. On the other hand, subarachnoid hemorrhage on head CT shows that there are some high-density images in the sulcus or gyrus, which are not very continuous, but scattered in all the corners of the cerebrospinal fluid drainage, and sometimes it is most common in the basal pools or the anterior pontine pools. Therefore, this aspect must be identified accordingly, and may be further clarified by head MRI.