Astrocytomas are divided into five categories: diffuse astrocytomas, mesenchymal astrocytomas, glioblastomas, glioblastomas, hairy cell astrocytomas, and gliomatosis cerebri, and their magnetic resonance imaging (MRI) performance varies with regard to the signal intensity, the presence or absence of peritumoral edema or hemorrhage, and the enhancement of enhancement scans. 1. Signal intensity: various types of astrocytomas mostly show low signal in T1WI and high signal in T2WI. Hairy cell type astrocytoma is divided into cystic and solid, and the T2WI signal of cystic part is higher than that of solid part. 2. Whether there is peritumor edema or hemorrhage: glioblastoma commonly has moderate to severe peritumor edema and hemorrhage in T2WI, while diffuse and mesenchymal astrocytoma and other types of hemorrhage and peritumor edema are rare. 3. Whether the enhancement scan is strengthened or not: on enhancement scan, diffuse and mesenchymal astrocytomas usually have no enhancement, cerebral gliomatosis shows mild enhancement, and glioblastomas and hairy cell astrocytomas show uneven and obvious enhancement. Astrocytomas are the most common neuroepithelial tumors, and MRI is the investigation of choice. If convulsions, seizures with neurological dysfunction and intracranial hypertension occur, astrocytoma should be alerted, and timely consultation should be made to improve the examination and correct treatment.