Drug safety is of crucial significance as it is directly related to the health and safety of patients.Minimizing adverse reactions and potential risks when using drugs to treat diseases is the core element to guarantee the medication safety and effectiveness in the public.Safety evaluation is an important means to measure the safety of drugs,including toxicological studies before the drug is marketed,safety monitoring during the clinical trial stage,as well as active and passive monitoring and risk management after the drug is launched.Through safety evaluation,potential safety hazards of drugs,such as adverse reactions and drug interactions,can be detected in a timely manner,and corresponding measures can be taken to prevent and resolve the hazards.This chapter aims to provide a reference for conducting scientific drug safety evaluations by comprehensively introducing the dimensions of drug safety evaluation and the corresponding contents and methods.