多糖是由單糖連接而成的多聚物，具有促進免疫調(diào)節(jié)、抑制腫瘤及降低血糖等廣泛的藥理作用，具有廣闊的前景；此外，由于多糖本身在質(zhì)量標準、表征鑒定等方面有自身研究難度和特殊性，有待于深入研究。對植物多糖的提取、分離、鑒定、結構分析及生物活性研究發(fā)展予以綜述。

Polysaccharides are combined by the monosaccharide. The investigation shows that the polysaccharides have the extensive function on immunity regulate, restraining tumor, and lowing the blood sugar. Therefore, their application has wide prospect.In addition, because there are many difficulties and distinctions of polysaccharides on the quality standards, structural characterization and so on, they need for further research.This article summarizes research developments on their extraction, separation, identification, structural analysis and biological activities.