The first thing to do if you encounter a left lacunar cerebral infarction is to clarify the basic morphology of the blood vessels. This is because once lacunar cerebral infarction occurs, it indicates that there is a possibility of abnormalities in the intracranial blood vessels. Therefore, it is very helpful at this time to improve the vascular examination and clarify the screening of other vascular diseases to decide the later treatment. After the vascular morphology is clearly identified, conservative treatment can be taken in the form of internal medicine first, such as applying aspirin and clopidogrel for antiplatelet aggregation treatment; oracetam and calf blood deprotein can be applied to improve cerebral circulation and cerebral protection treatment; a series of dehydration, cranial pressure lowering drugs and drugs to promote cerebral circulation can be actively applied, and even hyperbaric oxygen can be used for treatment. If there is no significant improvement after six months of regular medical conservative treatment, and there is a change in the nature of the narrowing or even occlusion of the large arteries, surgical treatment is required.