Common tests for hepatic encephalopathy include blood ammonia, plasma amino acids, evoked potentials, electroencephalogram, mental intelligence testing, and critical video scintigraphy. Hepatic encephalopathy is a syndrome due to severe liver disease or portal-somatic shunt, which is mainly characterized by personality changes, intellectual decline, behavioral disorders, impaired consciousness, fluttering tremor, myoclonus, hyperreflexia and pathological reflexes. The main auxiliary tests include blood ammonia, plasma amino acids, evoked potentials, electroencephalogram, mental intelligence testing, cranial CT or MRI, and critical video scintigraphy. Hepatic encephalopathy should be treated promptly, and daily attention should be paid to a balanced diet and nutrition, and protein intake should be avoided as much as possible during the coma period to ensure the positive nitrogen balance of the body. Try to provide calories and vitamins, while reducing the production and absorption of nitrogen-derived substances in the intestine.