FLAIR with high signal is a description of magnetic resonance imaging of the head, which is divided into T1 phase, T2 phase, FLAIR image and diffuse phase in MRI of the brain. FLAIR is clearer in the observation of white matter demyelination in the brain, and most ischemic lesions, inflammatory inflammatory lesions, demyelinating lesions, keratinocytic lesions and tumor lesions will appear as high signal on FLAIR images. The exact nature of the lesion will be confirmed by the patient’s medical history and other imaging studies. Secondary prevention of cerebrovascular disease and control of the underlying disease are also required.