Background:Acupuncture in China has a history of 2500. Large number of clinical studies confirm that acupuncture can improve patients with acute and chronic pain and reduce the use of analgesic drugs. As an auxiliary means of treatment of acute and chronic pain,acupuncture has been widely accepted. However, its mechanism is not clear.Objective:Discussion on the mechanism of acupuncture for analgesia.Ssummed up the field and effects used in clinical treatment, as well as the problems and needs to be and improved the problems about acupuncture for analgesia.Content:The mechanism of acupuncture for analgesia is not clear.There are Endorphin Hypothesis, Neurophysiologic Theory, Neurohormonal Theory，Neurogate Theory and Diffuse Noxious Inhibitory Control Theory. At present, more and more clinical treatments used acupuncture and it ways are varieties.It has been one of the treatments for chronic pain control. Trend:We need further studies confirm that the mechanism of acupuncture for analgesia.The postoperative analgesia in clinical application needs further research and development.