Abstract: Taking mushroom residue,corn stalks and peat as substrates of soil,we conducted a random block experiment to discuss the effects of combined application of organic and inorganic fertilizer plus GA₃ on growth,yield and fruit quality of Capsicum annuum in greenhouse vegetables.The treatments were as follows: A as CK,general fertilization (GF); B,CK+ GA₃; C,50% organic fertilization(OF);D:C+GA₃; E: 50% GF; F: E+ GA₃; G: 50% (GF+OF); H: G+ GA₃.The results showed that the effects of GA₃ on growth,fruit yield and quality of Capsicum annuum were significant under different fertilization conditions.Under normal fertilization conditions,the effect of GA₃ combined with organic and inorganic fertilizer (treatment H: 50% (OF+GF)+GA₃) on the growth and development of Capsicum annuum,fruit yield and quality was more obvious than that of application of organic or inorganic fertilizers alone or combined application of organic and inorganic fertilizers.Treatment B significantly effected growth,yield and quality of Capsicum annuum compared with treatment A; and treatment H was with the optimal effect.As for Capsicum annuum growth and yield,the plant height,yield per plant,and yield per plot with treatment H increased by 40.1%,82.7% and 12.0 kg more than those with treatment B,respectively; and increased by 9.6%,24.8% and 5.36 kg more than those with treatment G,respectively.As for Capsicum annuum quality,the Vc,soluble protein,and reducing sugar content with treatment H increased by 32.6%,37.8% and 65.0% more than those with treatment B,respectively,and increased by 15.4%,11.7% and 26.5% than those with treatment G,respectively.Therefore,the combination of organic and inorganic fertilizer plus GA₃ played an important role in Capsicum annuum production,which would be widely used in the off season cultivation practice in greenhouse vegetables.