The judgment of cerebrospinal fluid ear leakage can be based on medical history, clinical manifestations and auxiliary examination. 1. Medical history: cerebrospinal fluid ear leakage is commonly seen in traumatic fracture of the skull or after middle ear and inner ear surgery. 2. Clinical manifestations: aqueous ear leakage can often occur. When the tympanic membrane is broken, the cerebrospinal fluid flows out of the outer ear canal from the broken tympanic membrane; when the tympanic membrane is intact, the cerebrospinal fluid flows from the tympanic chamber to the nasopharynx through the eustachian tube, resulting in cerebrospinal fluid leakage. Some patients may also have headache and hearing loss. 3. Auxiliary examination: β-2 transferrin measurement and glucose measurement can be used to qualitatively diagnose the leaking fluid to determine whether it is cerebrospinal fluid ear leakage. At the same time, the location of the leak can also be determined by imaging tests such as CT and nuclear cerebral pool imaging. If there is any discomfort, it is recommended to seek prompt medical attention for diagnosis and treatment.