Oxygen may be effective in elderly lacunar cerebral infarction. The essence of cerebral infarction is ischemia and hypoxia in the brain caused by blockage of cerebral blood vessels, resulting in necrosis of brain tissue. During the acute stage of lacunar cerebral infarction, if the blood oxygen is unstable, giving oxygen can help to improve the state of hypoxia and ischemia of patients’ brain tissues and increase the metabolism of human cells, tissues and organs. In the recovery period of lacunar cerebral infarction, hyperbaric oxygen therapy can promote brain recovery, increase aerobic oxidation in brain tissue and promote the repair of neurological function. In old lacunar cerebral infarction, oxygen is generally not needed. It is recommended that patients with lacunar cerebral infarction adhere to a low-salt, low-fat, low-sugar diet in daily life, exercise appropriately to enhance physical fitness, and maintain a happy mood. Under the guidance of the doctor for treatment, do not do it by yourself to avoid accidents.