The effects of water and low temperature stress on germination of Onobrychis viciifolia seeds were investigated.Onobrychis viciifolia seeds were cultivated in a plant growth chamber with different PEG concentrations(10%,15%,20%,25%,and 30%) and the 5 ℃ cold pretreatment.Results indicated that different concentrations of PEG and the 5 ℃ cold pretreatment shortened the average germination time and increased the germination percentage of Onobrychis viciifolia seeds.30% PEG and low temperature stress for 4 days significantly improved germination of Onobrychis viciifolia seeds.