Both lower limbs are sore, soft and have no strength to walk for the following reasons: The first reason is that after long hours of walking or strenuous exercise, there is excessive lactic acid accumulation in the muscles of both lower limbs and inflammation of the fascia, which results in soreness, weakness and difficulty in walking. For this situation should ensure sufficient rest, for the lower limbs can take massage or hot compress treatment to accelerate local blood circulation, reduce pain. If necessary, you can also take oral non-steroidal anti-inflammatory and analgesic drugs for symptomatic treatment. The second cause may be cervical spinal cord lesion, because spinal cord lesion will lead to muscle weakness, numbness and difficulty in walking in the innervation area of both lower limbs. In this case, we should actively improve the cervical spine MRI examination to detect the cause and treat the disease in a timely manner. The third cause may be cranio-cerebral lesions, such as cerebral hemorrhage or cerebral embolism, which may also cause weakness and difficulty walking in both lower limbs. In this case, we should actively improve the cranial CT or MRI examination to clarify the cause and treat it as soon as possible.