Objective] To find the effects of soybean peptide liquid on maize seed germination and biological effects at seedling stage.[Method] Indoor aquaculture and greenhouse potting were used to research the maize seed germination and biological effects at seedling stage after soaking treatment of peptide liquid.[ Result] Peptide liquid at low concentration promoted the maize seed germination and biological effects at seedling stage; while high concentration showed inhibitory effect.[Conclusion] The 0.5 g/L soybean peptide liquid is the ideal concentration to promote maize seed germination.