The following departments are listed for leg weakness: 1. Hang neurology, there are many diseases that lead to leg weakness, the common ones are nerve injury, muscle injury or nerve-muscle junction injury in both lower limbs, which belong to the scope of consultation and treatment of neurology. If multiple peripheral nerve damage in both lower extremities, often accompanied by diabetes or uremia, perfect nerve conduction velocity examination of both lower extremities can be confirmed, neurology to give vitamin B1, vitamin B12 to nourish the nerve symptomatic treatment, combined with the original disease active treatment, related departments consultation. Muscle injury is common with polymyositis or dermatomyositis, patients will have muscle pain in the lower limbs, local pressure pain, blood sedimentation and blood muscle enzyme spectrum is significantly elevated, need to use hormone shock treatment. The neuromuscular junction damage is common in myasthenia gravis, which is an autoimmune disease of the nervous system and requires hormone or gammaglobulin shock therapy.2. Less common diseases involve other departments, such as patients with lumbar disc herniation, back pain accompanied by bilateral lower limb pain, which is clearly referred to the rehabilitation department for rehabilitation physiotherapy, and in severe cases to the orthopedic department for surgical treatment.