The results showed that the blood glucose levels in the diabetic mice were significantly reduced by PCE-C from 15.32 4.38 mM to 5.77 1.46 mM ( p < 0.001) in 7 hours. PCE-C was further purified by deproteinization, dialysis and Sephadex G-100 column chromatography and a fraction as PCE-F was collected. Seven hours after PCE-F injection at a dosage of 200 mg/kg body weight, blood glucose levels dropped significantly from 15.90 3.21 mM to 7.19 2.54 mM ( p < 0.01). PCE-F was identified by gas chromatography as a polysaccharide consisting of heterogeneous monosaccharides, such as glucose, galactose, arabinose and rhamnose.