Abstract: Abstract: Large amount micromolecule organic matters and saline ions was produced during the composting from green wastes, leading to low pH value and high electrical conductivity (EC), and so on. These problems will hurt the seedling in the course of cultivation. In order to increase the effective use of green waste and improve the quality of growing substrate, 2 kinds of ameliorants, including bamboo vinegar (the dilution ratio of 500 or 1 000, the addition content of 500 mL/g ) and medical stone (the addition content of 20, 40, 80 g/kg), were applied into green waste composting. Seed germination parameters, seedling growth, substrate pH value and EC, were measured as screening indexes to screen out their proportioning for effectively ameliorating growing substrate. The results showed that the addition of bamboo vinegar and medical stone decreased pH value and EC of green waste compost substrates effectively. Compared with the control, bamboo vinegar and medical stone addition decreased pH value by 1.15-1.20 and EC by 1 839-2 076 μS/cm in growing substrate. The addition of bamboo vinegar and medical stone had very significant effect on seed germination, and largely increased germination percentage, germination potential, germination index and vigor index. Compared with the control, germination percentage, germination potential, germination index and vigor index of the treatment E (1 000 times 500 mL/kg dilution bamboo vinegar + 40 g/kg medical stone) were higher by 41.66%, 44.99%, 9.70, 99.75. The treatments with the addition of bamboo vinegar and medical stone promoted seedling growth, and also increased chlorophyll contents, which accordingly increased the root weight, root length and seedling weight. The root length, chlorophyll content, plant height and seedling weight were high than the control by 4.01 cm, 0.3375 mg/kg, 0.139 g and 1.380 cm, respectively. Therefore, the treatments of applying 500 mL/kg 1 000 times dilution bamboo vinegar + 40 g/kg medical stone to the green waste compost substrates has the best effect. The results of the study will promote green waste compost waste used as substrate utilization.