A drug clinical trial is a test that when a new drug is invented or produced, a pharmacological and systematic study needs to be selected in a certain population, or in patients or healthy volunteers, to confirm or discover the clinical drug application. It can be used to analyze pharmacology and pharmacodynamics, pharmacokinetics, and also to detect adverse drug reactions and drug absorption, distribution, metabolism, and excretion. Clinical drug trials are conducted to determine the safety and effectiveness of drugs, and are divided into phase I, phase II, phase III and phase IV. Drug testing is an essential step in testing the safety of a drug before it is introduced into the clinic. Clinical research teams should conduct adequate clinical pharmacology and clinical pharmacology trials in order to make drugs widely available to clinical patients.