Abstract: Effects of QH acetone extracts on cold-resistance of rice seedlings by the way of soaking and spaying were studied. Rrice seedlings were treated under chilling stress when they were in two-leaf-one-leaflet period. The results show that: acetone extracts treatment can increase the content of protein, enhance and keep the activities of SOD, POD, CAT after chilling stress. acetone extracts treatment can also decrease the content of MDA, increase the content of free proline, delay the damage of chlorophyll caused by chilling stress, then enhanced the cold-resistance of rice seedlings.