The experiment was carried out in a facility greenhouse，and seven treatments，including rye，Vicia villosa Roth，Vicia sativa L.，oat，rape，Guizotia abyssinica Cass.and control，to study the effects of green manure on the yield，quality and soil physical and chemical properties of greenhouse green pepper.The result showed that:(1)Green manure treatment significantly reduced the electrical conducticity(EC value) of soil，in which oat treatment had the highest reduction rate，which was 52.00 μS/cm lower than the control，and the reduction ratio of other green manure treatments was 6.27%～18.80%.(2)Green manure treatments improved soil total nutrient contents. The soil total nitrogen content of rape and Guizotia abyssinica Cass.treatment was significantly higher than those of other treatments，the total phosphorus content of rye treatment was the highest and the soil total potassium content of Guizotia abyssinica Cass.treatment was the highest among all treatments.(3)Green manure treatment reduced the content of nitrate nitrogen in 0～100 cm soil layer of greenhouse vegetables，reduced the pollution of nitrate leaching to groundwater，and increased the content of soil available phosphorus.The nitrate nitrogen reduction range of Guizotia abyssinica Cass.seed was the largest among all treatments，and rye treatment had the largest increase of available potassium.(4)All green manure treatments improved the activities of soil urease and polyphenol oxidase.The treatments of the Vicia villosa Roth treatment had the largest increase，which increased by 18.0% and 39.1%，respectively，compared with the control.Green manure treatment increased the number of bacteria and fungi.The number of bacteria treated with oat and rape was increased by 11.0 and 7.3 times，respectively.The number of fungi treated with Vicia sativa L.increased by 6.6 times.(5)The yield of green pepper ranged from 4506.2 to 4625.7 kg/hm²，and oat treatment had the highest yield of 4625.7 kg/hm².Vicia sativa L.and oat increased the vitamin C content of green pepper by 21.0% and 7.9%，respectively.Oat treatment reduced nitrate content of green pepper by 20.1%.In greenhouse green pepper planting，green manure can effectively alleviate soil salinization，reduce nitrate leaching，and increase the contents of available phosphorus and potassium，total nutrients and organic matter.The comprehensive effect of oat on improving the quality of greenhouse green peppers is more significant，and it is worthy of popularization.