Whether or not the legs are heavy and weak after cerebral infarction can be recovered is related to the condition of the disease. If the cerebral infarction is mild, it is possible to recover after active treatment and timely rehabilitation; if the cerebral infarction is more serious or the treatment is not timely, it may leave permanent sequelae. Cerebral infarction is a critical condition in neurology, and once it occurs, brain cells will be irreversibly damaged. Common clinical manifestations include motor disorder (inability to coordinate, inability to walk); sensory disorder (sensory loss, sensory hypersensitivity, etc.); dystonia, muscle strength disorder (numbness and weakness of the limbs, or even paralysis); facial paralysis and eye movement abnormalities; and impaired autonomic function (excessive sweating, urinary and fecal incontinence, etc.). Therefore, patients may have symptoms of leg weakness. After patients with cerebral infarction are actively treated to get rid of the life-threatening disease, it is indispensable to have rehabilitation training for a period of time, such as strength training of limbs, which can help to recover the symptoms of leg weakness after cerebral infarction. If the degree of cerebral infarction is mild and the basic condition of the patient is good, the above symptoms may be recovered after active treatment and timely rehabilitation; if the cerebral infarction is more serious or the treatment is not timely, it may be difficult to recover and leave permanent sequelae. It is recommended that the patient should consult a doctor for treatment and rehabilitation under the doctor’s guidance.