Slightly high T1WI signal can be seen in hemorrhagic cerebral infarction, lipoma, glial cyst, abscess and so on. T1 signal alone cannot fully determine the nature of the disease, but also needs to be combined with the T2 signal changes and other sequences of imaging to determine the nature of the disease. T1WI high signal is a hint given by the MRI image, in the MRI image, the value of T1 is the shortest. The high signal T1 is the longitudinal relaxation time of the tissue in the MRI image, which represents the recovery time of the longitudinal magnetization.T1WI refers to the weighted image, which indicates the intensity of the tissue or organ in the image. 1. Hemorrhagic cerebral infarction: magnetic resonance examination often shows that there are uneven spots and pieces of equal signal or slightly high signal in the low signal area on T1. 2. Lipoma: MRI often shows high signal in both T1WI and T2WI. 3. Gliocysts: the most typical and common manifestation is high signal in T1WI and low signal in T2WI. 4. Abscess: according to the different time of brain abscess formation, the performance is different, in the acute encephalitis stage, the performance of T1WI is high signal. T1W1 high signal must be taken seriously, because T1W1 high signal is usually considered to be related to disease factors, and patients are often accompanied by symptoms of the original disease, such as headache, nausea, vomiting, slurred speech, monoparesis or hemiparesis, and so on. Slightly high T1WI signals should be treated under medical supervision to address the cause of the disease.