Terminal cancer pain is always a challenge to pain doctors. If the focus of the cancer pain is located in the restricted area, it is easy to control the pain. However, if the focus of cancer pain is widespread, it is very difficult to control the pain and it makes pain doctors embarrassed. Nowadays, the ultrasound-guided nerve block become a popular method. It is easy to find the nerve and helps to insert the catheter around the nerve for the continuous nerve block. We encountered a patient who was 59 years old with a stomach cancer and vertebral metastasis. He complained about the pain in his abdomen, back and left thigh. His abdominal and back pain vanished with the use of continuous lumbar epidural injection. However, the patient still complained about the pain and numbness on the left thigh, because of this, he couldn't get any sleep. We tried a continuous femoral nerve block under the ultrasound guidance, after that his pain was gone. The ultrasound-guided nerve block will be very helpful to control the pain.