In order to improve the growth ability of pepper continuous cropping,the ability of companion crops to improve the soil microenvironment of continuous pepper cropping was studied.Taking the companion oats as the research object of companion crops,according to the specific pot experiment,the companion oat group and the singlecropping pepper group were set up to analyze the effect of the companion oats on the leaf growth ability of the test pepper varieties and the improvement of the soil microenvironment.The results showed that the soluble sugar content and catalase activity of pepper leaves were increased by 62.2%and 83.3%compared with CK,respectively,there was no difference in malondialdehyde content between leaves and CK.Treatment with associated oats reduced the soluble protein of pepper leaves.However,the vitamin C content and soluble sugar content of pepper fruits were significantly higher than that of CK,which increased by 55.00% and 19.72%,respectively.The soluble protein and dry matter content of pepper fruits treated with associated oats were lower than CK,which decreased by 44.44% and 7.6%,respectively.The transpiration rate,stomatal conductance,photosynthetic rate and carbon dioxide concentration of pepper leaves treated with associated oatmeal were lower than CK,which were reduced by 154.5%,1 115.8%,11.47%and 116.32%,respectively.However,the chlorophyll content increased by 3.3%compared with CK.The fluorescence parameters F₀,F_m,and F_v of the associated oat treatment were lower than those of CK,with decreased by 21.65%,22.12%,and 20.1%,respectively.The fluorescence parameters F₀/F_m and F_v/F_m showed no significant difference than CK,the F_v/F₀ of the associated treatment was greater than that of CK,and the contrast increased by 2.18%.The activities of hydrogen peroxide,cellulase and sucrase treated with associated oats were higher than CK,increasing by 4.35%,127.66% and 3.95%,and soil urease activity was lower than CK,decreasing by 10.72%.In summary,the associated oat could improve the activity of protective enzymes in pepper leaves,improve the soil microenvironment of rhizosphere of pepper in continuous cropping,and provide a theoretical basis for high-yield cultivation of pepper in arch shed.