When sustained and controlled drug-release materials are applied

the drug can be long-term released stably

and the disease can be treated more effectively by the drug. Polymer materials are one important kind of the sustained and controlled drug-release materials

which can be classified into two categories

i.e

natural ones and synthesized ones

among which

natural ones used as sustained and controlled drug-release materials have been studied for many years and well recognized by people. Thus the research development of synthetic polymer materials used as sustained and controlled drug-release systems are only reviewed in this paper

the preparation method

drug release mechanism and applicative drugs of these polymer materials are introduced

aiming at providing basis for the synthesis and enlarging the application areas of these materials.