Chemotherapeutic drugs are divided into six categories according to their sources and mechanisms of action.1. Alkylating agents, which mainly act on DNA in human cells, thus affecting cell division. Alkylating agents commonly used in clinical practice include cyclophosphamide, maryland, nitrogen mustard, cyclohexylnitrosourea, etc. 2.Anti-metabolic chemotherapeutic agents, which are structurally different from normal human metabolites and prevent the normal metabolism of the body by competing with metabolites for the relevant receptors and enzymes. 3.Anti-cancer antibiotic chemotherapeutic agents, which are a class of Anti-tumor substances derived from microorganisms, mostly produced by actinomycetes. These drugs are mainly mitomycin, adriamycin, cisplatin, pinyin, etc. 4.Phytochemical drugs, semi-finished products extracted from plants, commonly used drugs are pergolide, pergolide, pediculoside. 5.Other types of chemotherapeutic drugs, commonly used drugs are cisplatin, carboplatin, whose mechanism of action is to cause cross-linking between DNA strands, affecting the function of DNA templates, thereby The mechanism of action is to cause cross-linking between DNA strands, which affects the function of DNA templates and ultimately inhibits DNA synthesis.6. Hormonal chemotherapeutic drugs, commonly used drugs include megestrol, progesterone, prednisone, etc.