Effects of different varieties agricultural residues(wheat straw,rice husk and mushroom dregs)on photosynthetic characteristics,quality and yield of green peppers were studied by returning treatments.The results showed that agricultural residues promoted photosynthetic pigment contents and antioxidant enzymes(SOD,POD,CAT)activities,reduced MDA content.The chlorophyll content of T3(added mushroom dregs)was the highest,which was 1.045 3 mg/g FW,the carotenoid content reached the highest under T4(added both wheat straw and rice husk)for 0.257 8 mg/g FW,the ratios of Chla/Chlb,Chl(a+b)/Car.For T3 were the highest,which were 3.22,4.12,respectively.Furthermore,agricultural residues restrained flavonoids content and anthocyanins content in pepper fruit effectively.Under T3,the soluble sugar and Vc contents in peppers were increased by 81.20%,15.84% compared with T7,while the soluble protein and free amino acid contents of T4,T1 were the highest respectively.The results also showed that the yield of green peppers under various agricultural residues was lower than single returning treatment,the yield reached the highest under T3 by 48 255.75 kg/hm2.