The elderly can’t lift their legs when walking, which is common in the following diseases: a. cerebrovascular disease, cerebral infarction or cerebral hemorrhage, can appear unfavorable limb movement, can’t lift their feet, do cranial CT, if there is cerebral infarction, it is recommended to give aspirin, statin drugs, and brain heart, thrombosis and other drug treatment. Second, lumbar disc herniation, when the lumbar disc compression nerve can cause one side of the leg can not lift up, do the lumbar spine CT or magnetic resonance can be clearly diagnosed, the light can be rehabilitative physiotherapy treatment, the heavy need to perform surgery. Third, electrolyte disorders, especially hypokalemia, can appear weakness, two legs can not lift, check the electrolytes, if there is hypokalemia, it is recommended that oral or intravenous potassium supplementation treatment.