Abstract: Taking tomato and cucumber as the test materials, the effects of control（WZ0）,low（WZ1）,medium（WZ2） and high（WZ3） four different microalgae amounts on the soil quality, yield and quality of tomato/cucumber in greenhouse were studied by drip irrigation, in order to provide reference for exploring and improving the soil quality and ecological environment, and then realizing the sustainable and green development of greenhouse vegetable.The results showed that from the second season（2020 cucumber season）,the contents of organic matter and nitrate nitrogen in soil treated with microalgae（WZ1,WZ2 and WZ3） were significantly higher than those in control treatment（WZ0）,with an increase range of 7.0%-39.1% and 22.6%-47.0% respectively.The content of soil organic matter with appropriate amount of microalgae（WZ1,WZ2） was more than that with high amount of microalgae（WZ3）,which increased significantly by 11.3%-23.5%.Compared with WZ0,there was no significant difference in soil available phosphorus, available potassium, EC value and pH among WZ1,WZ2 and WZ3 treatments, and the nutrient content of facility soil was at the medium level or above after seedling pulling.The seasonal yield of tomato between treatments was 48.1-49.3 t·hm^-2 and 69.3-74.3t·hm^-2 respectively,and the seasonal yield of cucumber between treatments was108.3-112.6t·hm^-2 and 168.5-177.1t·hm^-2 respectively.There was no significant difference of yield among treatments in the four seasons of the two years,and the actual yield level did not reach the target yield level.WZ1,WZ2and WZ3treatments effectively reduced nitrate content in fruits compared with WZ0 during the duration of experiment.Therefore,applying microalgae into facility soil could significantly improve the content of soil organic matter and nitrate nitrogen,and significantly reduce the nitrate content in fruit,while high amount of microalgae would reduce the effect of improving soil organic matter.