A new semi-synthesis method for flavonoid glycosides diosmin was performed. And the antiproliferative activity of the diosmin sample against six common cancer cells was determined. Diosmin was prepared from available and inexpensive hesperidin using DDQ as the dehydrogenating agent. After purified through the Sephadex LH-20 column, diosmin was identified by HPLC-MS and 1H-NMR. It was confirmed that the transformation method is feasible for the synthesis of flavonoid glycosides. The final synthesis process is: raw material ratio 1:0.4, reaction temperature 110℃ (oil bath temperature), and reaction time 6 hours. The results of this study will provide a new idea for the synthesis and application of diosmin.