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PLGA, poly (lactic-co-glycolic-acid), is a kind of biodegradable functional macromolecular organic compounds. PLGA, certified by the Food and Drug Administration (FDA), possesses desirable features of biocompatibility, nontoxicity and no immune response, and is being widely applied to human clinical medical research. Because of its biodegradability, simple synthetic methods, controllability of degrading rate and desirable plasticity, PLGA was applied in large quantity into the carrier materials which is to control the release in recent years, gradually propelling PLGA microsphere controlled release system to be the most ideal drug-carrier system at present. As the carrier of drug and genes, PLGA is mainly researched on its features as the carrier, synthetic methods, different surface modification methods, and the applications on different drugs, genetic treatments and genetic vaccines.

Chitosan is a kind of natural polymer commonly applied for nanomaterials, which is affluent in nature with favorable biodegradability and biocompatibility and free of toxicity or odor. In clinic it can be used as a drug carrier for the treatment of cancer, and also it is a kind of new pharmaceutical excipient. To prepare chitosan nanomaterial, various method are used, such as ionic crosslinking, covalent crosslinking, precipitation, free radical polymerization, reverse micelle, spray drying, and self-assembly. Furthermore, plenty of anti-tumor drugs, including adriamycin, epirubicin, taxol, 5-fluorouracil, norcantharidin, folic acid, and so on, are also attempted to load on these chitosan nanocarriers. In addition, the mechanism for those nanocarriers carrying anti-tumor drugs acting on tumor cell were explored, and the formulation mainly include electric charge adhesion effect, suppressing the proliferation of tumor cells, adjusting or enhancing immune ability of the body and inducing apoptosis. This paper compared the characteristics of different preparation methods on chitosan as a nanodrug carrier, summarized the types of packaged drugs, analyzed the mechanism of the chitosan as nanodrug carriers. It can provide valuable reference for researchers' further work.