The so-called three-step medication is to give analgesic medication in steps according to the different degrees of cancer pain. The first step of medication is mainly for patients with mild pain of 1-3 points, and the more commonly used drugs in clinical practice are Daphne, acetaminophen and ibuprofen. The second step of medication is mainly for patients with 4-6 points of moderate pain, and the more commonly used drugs are aminophenol oxycodone, tramadol extended-release tablets, and bupropion tablets. The third step of medication is mainly for patients with 7-10 points of severe pain, currently the more commonly used clinical morphine immediate release tablets, oxycodone extended release tablets, morphine extended release tablets and fentanyl transdermal patches, etc.