Cranial magnetic resonance has become an ideal tool to study the physiopathology of cerebrospinal fluid because of its non-invasive nature, multiplanar imaging and sensitivity to flow. The general infantile hydrocephalus MRI mainly shows enlargement of the ventricular system, paraventricular edema, cortical thinning, and compression of the surrounding brain tissue. Using MRI gated cine phase-contrast sequences, the cerebrospinal fluid of obstructive hydrocephalus, orthostatic hydrocephalus, and traffic hydrocephalus diseases can be quantitatively measured to gain a deeper understanding of their pathology and pathogenesis. Magnetic resonance can accurately quantify the cerebrospinal fluid flow in diseases with cerebrospinal fluid circulation disorders, showing different features and clarifying clinical diagnosis. The quantitative analysis of traffic hydrocephalus before and after ventricular shunt using magnetic resonance can estimate its postoperative effect and provide some guidance for clinical treatment. In children with hydrocephalus, their MRI images also change. Special emphasis is placed on fetal hydrocephalus in some pregnancies, and fetal MRI can be done in advance, so that the size of the fetal ventricles and the presence or absence of abnormal structures in the brain tissue can be detected, which in turn can provide some guidance on whether the fetus can be born, or treated after birth.