With biodegradable material poly(ethylene glycol)-poly(lactide-co-glycolide) (PEG-PLGA) as substrate, the size distribution of Rg3-NPs was approved by the scanning electron microscopy. MTT assay was used to detect the effects of Rg3-NPs on the growth rate of C 6 cells at various concentrations and flow cytometry(FCM) was applied to assay the cell cycle and cell apoptosis of C 6 glioma cells. Western blot analysis was used to measure the protein level of PCNA. The results show that Rg3-NPs are slick and uniformity, the average diameter of the nanoparticles is about 75―90 nm, entrapment efficiency is (89.7±1.7)%. MTT assay shows the growth of C 6 Glioma Cells can be significantly inhibited by Rg3-NPs in a dose-dependence manner. FCM and Western blot analysis show Rg3 can be released from the conjugated nanoparticles to function in the cell nuclei so as to lead to the changes in the growth cycle of the cells, which results in the arrest of G 0-G 1 cell cycle and induces the apoptosis of C 6 cells. Therefore, Rg3-NPs may be used for the auxiliary therapy of brain glioma.