As the investigators all know, pain, as an ancient enemy to human kind, was one of the most mystical phenomena within our body. For centuries, people search the magic wand to solve this issue and reach the heaven destination. However, like our original sin commit by Adam and Eve, the shadow of pain always surround and even rebel our body and spirit. Even more, pain traps our soul and body not only for the acute stage induced by noxious stimulation but also change our mind and body whenever chronic period start even the stimulation disappears. Pain so far has become one of the greatest health issues for modern people. It affects millions of people and the treatment options are quite limited and not effective everyone. Drugs for pain relief are quite few kinds and associated with lots of side effect. On the other way, why and how people develop chronic pain, especially when there is no further painful stimulation, remain to be investigated. The integrated project, combining with our preliminary study and novel findings in our university (TM, IL-20, HD), will not only set a platform for pain drug discovery and their possible pathway in pain mechanism but also provide important clinical data for patients with severe pain under major surgery. Four sub-projects were included in this integrated project: 1. IL-20 is important in analgesia and pain mechanism. 2. the potential of thrombomodulin as an analgesic. 3. Huntington mice produce less pain behavior. 4. The relationship of morphine consumption and TM, IL-20 and HD protein for post-operative patients.