Effects of seed treatment by different concentration of PEG-6000（polyethylene glycol）in Japonica Xi-giant embryo-1 and japonica rice Hexi-22-2（with small embryo）were studied. The results indicated that the germination energy,seed germination rate and germination index were lower than that of Hexi-22-2. The germination of Japonica Xi-giant embryo-1 to be suppressed by the PEG treatment after 24 hours water seed soaking,and the seed germination rate decreased with increasing concentration of PEG. The treatment that water culture after 24 hours seed soaking with different concentration PEG water can promote germination and emergence ability of rice,but the PEG seed soaking with 5% concentration had the greatest effect on promoting germination and emergence ability of Japonica giant embryo rice