Abstract: To study the effects of exogenous H2O2 on germination and regulation of endogenous hormone contents of‘Siberia’lily, the authors used five different concentration gradients of hydrogen peroxide solution (H2O2 aqueous solution), which were 0, 0.5%, 3%, 5%, 10%, respectively, and 0.5 mmol/L DMTU (exogenous H2O2 scavenger) to treat the small lily bulbs 30 days. The results showed that 5% H2O2 had a great influence on the rooting and sprouting of lily bulbs, the effect of 0.5 mmol/L DMTU treatment was not ideal compared with 5% H2O2; the ABA content decreased, while the GA and IAA contents increased, and had a more significant variation than control during the rooting and sprouting of lily bulbs. The suitable concentration of exogenous H2O2 could be beneficial to lily bulbs’germination.