The common causes of heavy leg walking are the following: first, lumbar spinal stenosis, lumbar spinal stenosis of the central spinal canal and nerve root canal, can make the spinal cord and nerve root blood circulation disorders, resulting in nerve ischemia, hypoxia, nerve innervation of the lower extremity muscles, can cause muscle weakness, manifested as walking with heavy lower extremities, in severe cases, can also appear claudication, improve nerve blood supply treatment, the symptoms can be alleviated; second Second, patellofemoral arthropathy, patellofemoral joint cartilage injury, can cause secondary quadriceps atrophy, manifested as walking, especially when walking up and down the stairs heavy legs, weakness, strengthen quadriceps strength and strength training, can improve the heavy leg symptoms, the serious condition should be switched to knee surgery treatment.