Abstract: Two pumpkin rootstocks（‘Golden rootstock’ and ‘Japanese Cedar’） and one pumpkin variety（‘Miben Pumpkin’） were used as test materials.When the two cotyledon of seedlings were normal, the dose of 0,1,2,4,6 mmol·m^-2·d^-1 and 8 mmol·m^-2·d^-1 EOD-FR was added at 19:30 every day.The effects of different doses of EOD-FR on hypocotyl elongation, morphological development and pigment content of different pumpkin seedlings were studied, in order to provide reference for the use of far-red light in the cultivation and grafting of pumpkin in facilities.The results showed that the hypocotyl length of the three pumpkin seedlings increased with the increase of the far-red light dose.The hypocotyl length of the ‘Golden Rootwood’ and ‘Japanese Cedar’ seedlings was close to saturation at the far-red light dose of 4 mmol·m^-2·d^-1,and the hypocotyl length of the ‘Miben pumpkin’ seedlings was close to saturation at the far-red light dose of 2 mmol·m^-2·d^-1.However, different doses of EOD-FR had no significant effect on dry matter accumulation and seedling strength index.In conclusion, the addition of appropriate dose of EOD-FR can increase the hypocotyl length of seedlings without affecting the strong seedling index, which is conducive to improving the survival rate of grafting.