Elderly leg weakness can be solved through etiologic treatment, and lower limb muscle training. First, the decline in the physical function of the elderly, the scope of activity is reduced, muscle atrophy, will be manifested as weakness of the legs, especially when going up and down the stairs will be obvious fatigue, can be through the quadriceps resistance training, so that the muscle strength and power to be restored, such as in the ankle binding sandbags for calf straightening exercises, 50-60 times per group, complete 4-6 groups per day, three months after the significant increase in the lower limb muscle strength. Second, if the lumbar spine disease caused by nerve compression leads to lower limb weakness, in addition to strengthening the lower limb muscle training, should also be timely treatment of lumbar spine disease, such as lumbar ultrashort wave therapy, lumbar traction, etc., to lift the nerve compression to restore the muscle power of the lower limbs.